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Administrative Team

Diane Dunne

Head of School
Diane Dunne, Head of School, received her B.A. in International Relations from the University of Pennsylvania and her Masters in Social Work from Atlanta University.  She has worked as an educator, both in teaching and administration, for over twenty-five years.  Before coming to Mackintosh at the beginning of the 2012-2013 academic year, Ms. Dunne worked for many years at Foothills Academy in Wheat Ridge, Colorado, teaching in first, second, seventh and eighth grades, and in high school, and also serving ultimately as head of the high school and interim head of school.  Prior to that, she worked as lead coordinator of a middle school program for an independent school in Atlanta, Georgia. She also has an extensive background in leading students on beyond-the-classroom learning experiences, such as service and wilderness/outdoor trips, both in the United States and Central America. She is committed to working with students to help them to foster a love for learning, a strong global awareness, and a sense of service. She enjoys reading, poetry, backpacking, cross-country skiing, spending time with her family, and learning, side-by-side, along with the young people in her classroom.

Beth Steklac

Assistant Head of School and Director of Admissions
Beth Steklac, Assistant Head of School and Director of Admissions, joined Mackintosh Academy in 2003 and is a parent of two Mackintosh graduates. She holds an MBA from the University of Toronto and a Bachelor of Science in Electrical Engineering from Queen’s University in Kingston, Ontario. Beth has participated in numerous IB trainings and workshops to enhance our IB program, as well as trainings in administration, admissions and financial aid. Beth is passionate about the learning styles of gifted children, particularly in science and math. Beth is also an avid traveller and enjoys exploring our global community with her family.

Arleen Brogan-Smith

Business Manager
Arleen Brogan-Smith, Business Manager, began working at Mackintosh Academy in 2003 after a successful career in public accounting. She is accomplished in finance and accounting with experience in a wide range of accounting, financial management, internal controls, risk management, IT, payroll, HR and benefit functions. As a Certified Public Accountant she served private, public, and non-profit organizations. She compiled corporate, not-for-profit, partnership, and individual income tax returns, and audited private, SEC, and not-for–profits. She has owned and operated her own private company and worked with local CPA firm. She received the Bachelor of Science, Accounting, with highest honors and has been a member of American Institute of Certified Public Accountants. Arleen is active in the local art community. When not working at accounting, she can be found playing, walking and training her dog, planting and weeding in the garden, or in her studio painting.

Sharon Muench

Curriculum Coordinator and Middle School Mathematics Teacher
Sharon Muench, Curriculum Coordinator and Middle School Mathematics Teacher, is responsible for curriculum coordination and daily teacher support in the areas of curriculum and instruction. Ms. Muench has been affiliated with Mackintosh Academy since 1994 as a lead teacher, a co-teacher, curriculum coordinator, and the technology coordinator. She holds a Masters certificate from the University of Colorado in Web Based Instructional Technology. She has her B.A. from the University of Iowa in English and has her certificate in Secondary English Education. She is passionate about her position and highly invested in ensuring the tenets of the International Baccalaureate program and educational philosophy of Mackintosh Academy is fully embodied on our campus.

Kristi Holmes Espineira

Director of Marketing
Kristi Holmes Espineira, Director of Marketing, has been involved with Mackintosh Academy in a number of roles since 2003 (parent, teacher, board chair, director of advancement). She leads marketing and social media for the school. Kristi has an AB in English from Stanford University, and graduate degrees in English from the University of Arizona and UCLA. Prior to joining Mackintosh, she ran her own communications/social media consulting firm for small businesses and helped to run a technology startup firm with her husband. She enjoys putting her writing and communications skills, and her deep passion for gifted education, to work in the service of spreading the word about Mack! Her two children are Mack grads and are currently studying at the University of Denver and New York University.

Tami Vinson

Director of Development
Tami Vinson, Director of Development, joined Mackintosh in Fall 2019 and is a parent of a Pre-Kindergartener. Tami leads the development program and philanthropic efforts for the school. Prior to joining Mackintosh, Tami was a fundraising consultant with Dini Spheris, where she worked with various non-profit organizations including more than a dozen independent schools. Tami brings over 15 years of fundraising experience and has a Bachelor’s degree in Business Administration from Auburn University, a Master’s degree in Management in Non-Profit Organizations from the University of Georgia, and is a Certified Fund Raising Executive (CFRE).

Philanthropy and mission have been in Tami’s vocabulary since she was a young volunteer. Today, Tami still gives her time actively to various nonprofit organizations including serving on the Steering Committee as the Chair of Mentoring for the Institute for Leaders in Development program at the University of Denver. A program for which Tami is also a graduate.  Tami has also served as President of the Association of Fundraising Professionals (AFP) Colorado Chapter and National Philanthropy Day Chair.

Tami is thrilled to join the Mackintosh community where she can merge her professional experience and personal life. Tami comes from a family of educators and is inspired and fueled by Mackintosh Academy’s mission of keen minds, compassionate hearts and global action. Tami, her husband and their daughter, Zoe, are excited to have found this wonderful community.

Denise Sironen

School Psychologist & SEL Coach
Denise Sironen, School Psychologist & Social Emotional Learning Coach, has spent her career working with students and staff in a school mental health capacity. She has twenty-eight years’ experience as a licensed school psychologist working with all ages of students. Denise has also worked as a district coordinator of behavioral and mental health services. In addition to her work at Mackintosh she provides training for teachers and parents around social-emotional issues, runs parenting classes (including those for parents of gifted and 2E), and is a parent coach. Denise earned her Master’s in Educational Psychology and her Bachelors in Psychology, both from the University of Colorado. In addition to her mental health work, she is the proud mother of three young men and the not-so proud mom of two naughty but loveable dogs. She enjoys riding bikes with her husband of almost thirty years, spending time outdoors, and is a voracious reader.

Sarah Schultz

Office Manager
Sarah Schultz joined the Mackintosh team as a parent in 2018 and as office manager in 2019. Sarah holds a Bachelors degree in political science and a Masters degree in education policy from the University of Colorado School of Education. She was the Director of International Programs at Colorado College, where she advised students interested in study abroad, worked with faculty to design new overseas programs, and provided support to the international students on campus. She has two children, one of whom is a middle school student at Mackintosh Academy.


Ocean Sehlmeyer

PreKindergarten Lead Teacher/Director
Ocean Sehlmeyer, PreKindergarten Lead Teacher, has been an Early Childhood Educator for the past seven years. In 2016 she earned her Director’s Certificate at Arapahoe Community College, and in 2020 she completed her Master’s Degree in Early Childhood Special Education at the University of Colorado Denver. She is currently completing additional graduate work in educational coaching to be a supportive resource for fellow educators. Her teaching philosophy is rooted in the inquiry-based educational model that promotes creative thinking, independence, and problem-solving. As a teacher she intentionally provides moments and materials that spark curiosity and a love of learning while also building a community of compassionate students.

Ocean lives in downtown Littleton with her husband Jesse and their two daughters, ages 18 and 15. As a family they care for several pets and travel, both locally and abroad, whenever possible.

Uta Letbetter

Uta Letbetter

PreKindergarten Associate Teacher
Uta Letbetter is a native of Colorado and joined Mackintosh Academy as a part-time teacher associate in the PreK classroom in January 2022. She is currently earning her Associate of Arts Degree to become an associate teacher/director with plans to earn her master’s degree in early childhood education. She is a Fulbright Scholar and has a Bachelor of Arts in English and German and a Business Minor from the University of Denver. Prior to joining Mackintosh Academy, Uta worked as a co-owner and primary administrator of a Denver-based retail and wholesale import/export business for 25 years.

Uta lives with her husband, their two energetic teenage boys and Rooney, their family Cockapoo. She has lived in Germany and Shanghai and has many volunteer hours in both the public elementary school and British International elementary school where her sons attended. Uta is passionate about creating and supporting a joyful and creative environment which instills a joy and passion for learning among our youngest students. She loves to spend time with her family and friends, and likes to hike, canoe, snowboard, read, travel and write.

Kellyrae Meadows

Kindergarten Teacher
Kellyrae Meadows is delighted to be joining the Mackintosh Academy community as the Kindergarten Teacher. Kellyrae received her BA in Interdisciplinary Studies of Elementary Teaching from the University of Northern Colorado. She holds a K-6 Professional teaching license with a K-12 Culturally and Linguistically Diverse license endorsement. Kellyrae has worked for nearly 10 years in education in various roles and has worked with all ages of students. This will be her fifth year as a classroom teacher.

In her free time you might spot her at the local rock climbing gym, perusing a book store, in the mountains with her two rescue pups (Koda and Puccini) or teaching a yoga class. Mindfulness is very important to Kellyrae and she hopes to share her mindfulness practice and strategies with our community.

Greg Ashworth Fanch

PreKindergarten & Kindergarten Associate Teacher, Photographer and School Safety
Greg Ashworth-Fanch, Pre-Kindergarten & Kindergarten Associate Teacher, Photographer and School Safety, received his teacher’s license through CU of Denver in 2005 by completing the teacher training program at Stanley British Primary where he co-taught under the supervision of two mentor teachers in a multiple-age classroom. Mr. Ashworth earned his BA in journalism with a minor in anthropology through Metropolitan State College. He has also completed nearly 2000 hours of study in therapeutic massage, half of those spent in anatomy, physiology, and neurology, and is a certified massage therapist. Greg has been at Mackintosh Academy since 2005 as the MS2 lead teacher. His passions in life include his family, sharing a love of learning, music, and mountain biking. During rare free moments Mr. Ashworth enjoys playing his blues harmonica, bamboo saxophone, and his Native American flute.

Delaney Monroe

1st Grade Lead Teacher
Delaney Monroe, 1st Grade Lead Teacher, started her teaching career after college by leading after-school inquiry based science lessons for mixed-age groups. She loved creating the environment and watching her students make discoveries on their own. Her joy in educating her students led to her earning a Colorado K-6 teaching license through the Friends’ School of Boulder in 2014. She began working in a Title I school serving a high needs population: She had experience teaching both 5th grade and 1st grade. In 2018, Delaney decided it was time for a change and found a position in a Waldorf school as a Kindergarten assistant. This experience in a private school was refreshing and led to extra time to deepen her craft. Delaney returned to school in 2020 studying art and added the K-12 Visual Arts endorsement to her teaching license.
When not teaching, Delaney can be found hiking or skiing in our beautiful mountains. Or maybe she’s sitting with her cat, Sherman, reading novels, writing poetry, and creating art.

Lara Pausback

2nd Grade Lead Teacher
Lara Pausback, 2nd Grade Lead Teacher, holds a Colorado teaching license as well as a Colorado Reading Teacher license. She earned her Bachelor’s degree in history from the University of Colorado, Boulder as well as a Masters in Curriculum and Instruction from the University of Colorado Denver. She is also trained in the Orton-Gillingham reading approach. After graduating with her BA, she traveled in South America with her future husband Joe Pausback, who is now one of the 7/8 grade teachers at Mackintosh Academy. While traveling she practiced her Spanish and was inspired to become a teacher. Upon returning to the United States she enrolled in a teacher licensing program in Durango, Colorado at Fort Lewis College. After receiving her Colorado Teacher License she moved back to Denver where she taught in public schools until she and her husband started a family. Ms. Pausback worked as a learning specialist helping children with reading difficulties until she came to Mackintosh Academy. She is the mother of two Mackintosh alumni.

Lula Guilbert

3rd/4th Grade Lead Teacher
Lula Guilbert, 3rd/4th Grade Lead Teacher, began her experience in gifted education with her own elementary and secondary education. She went on to graduate Magna Cum Laude with a BA in Liberal Studies from Sonoma State and then earned her Masters of Education from UMass Boston. Throughout her college career, Lula worked with students ranging in age from preschool to high school and her educational philosophy was shaped in part by her interactions with children at various stages of growth and development. Lula moved to Colorado with her family in 2002 and began working at Mackintosh in 2003. She became the lead teacher in the Primary 2 classroom before taking time away to nurture her own young family. She returned to Mackintosh in 2008 and was previously a lead teacher in the 2nd/3rd grade classroom. She is currently the lead teacher in our 3rd/4th grade classroom. She returned to Mackintosh in 2008 and has been the lead teacher in our 3rd/4th grade classroom since that time. In addition to her passion for gifted education, Lula also enjoys gardening, yoga, playing games with her family, and relaxing with her chickens.

Mia Dixon

3rd/4th Grade Lead Teacher
Mia joined Mackintosh as a 3rd/4th Grade Lead Teacher in the fall of the 2021-2022 school year. She earned her Master of Science in Teaching as well as her undergraduate degree in Visual Arts from Fordham University in New York City. She is originally from the island of St. John in the United States Virgin Islands, and she has lived and taught all over the world. Her most recent role before Mack was as a third grade teacher and peer coach at an independent school in San Mateo, California. She also co-led a bilingual French/English classroom at an independent school in San Diego. Before that, she spent four years as team leader for a third grade teaching team at an international school in Singapore and exploring South East Asia. She loves working with and supporting young people who are finding their places in the world and beginning to explore their passions.

Outside the classroom she enjoys rock climbing, travel, sewing, hiking, scuba diving, cooking, and, most recently gardening, and raising chickens in her backyard.

Darrah O'Flaherty

3rd/4th Grade Associate Teacher
Darrah O’Flaherty, 3rd/4th Associate Teacher, is a Colorado native who moved to North Carolina to study business and leadership at Elon University before moving abroad and transitioning to a career in teaching to fulfill her passion of working with kids. 2021-22 will be her fifth year of teaching having taught 6th grade in Thailand for two years, fifth grade in the U.S for one year, and most recently, Kindergarten for one year in a support capacity. Darrah has passed her Praxis exams and is currently pursuing her Masters and Teaching License in Elementary Education at Regis University, of which she is now in her final year.

In her free time, Darrah is an avid traveler and lover of the outdoors who enjoys rugby, hiking with her rescue greyhound, camping, reading, and snowboarding. Darrah feels lucky to enjoy the creativity, inquisitiveness, empathy, and sheer joy that children bring to their studies and daily lives.

Nancy Muhich

5th/6th Grade Lead Teacher
Nancy Muhich, 5th/6th Grade Lead Teacher, is originally from Toledo, Ohio. She was originally educated at Miami University, OH in Marketing, but came to teaching as a second career.  She learned her teaching trade through the Stanley British Teaching Program, and is completing her Masters in Education at CU Denver.  Nancy started teaching at Mack in the fall of 2013.  The strong culture of kindness at Mackintosh was a terrific fit with Nancy’s natural disposition, and she loves teaching her students through units of inquiry in the International Baccalaureate program.  Nancy loves children and dogs, she dabbles in crafting,  and is a roller coaster enthusiast. She has found her happy place teaching in the 5/6 room at Mackintosh.

Roger Chow

5th/6th Grade Lead Teacher
Roger Chow, 5th/6th Grade Lead Teacher, holds a Colorado teaching license as well as a Colorado Reading Teacher license. He earned his bachelor’s degree in American Studies from Middlebury College in Vermont as well as a master’s in educational leadership from the University of Denver. He is trained in the Inquiry-Based Instructional approach by Dr. Lauran Resnick from the Institute for Learning out of the University of Pittsburgh. After graduating with his BA, he traveled the globe to seek out unique experiences and people. He began as a paraprofessional in Broward County, Florida, then moved to Denver where he taught in Denver Public Schools until he moved to Tacoma Washington to take on the role of Director of Curriculum and Instruction. Mr. Chow returned to Colorado and served as Executive Director of Secondary for Pueblo City Schools.

Joe Pausback

7th/8th Grade Math and Science Teacher
Joe Pausback, 7th/8th Grade Math and Science Teacher, known affectionately as “Mr. P”, began teaching at Mackintosh in 1998. He received an undergraduate degree in anthropology and history from the University of Colorado in Boulder. After a brief career as a field archaeologist in Alaska and New Mexico, he returned to school and earned a secondary social studies license from Fort Lewis College. He later earned a Master’s Degree in elementary education from the University of Colorado at Denver. His Master’s thesis was a justification for teaching the concept of randomness to upper elementary students as part of their studies of statistics.  Mr. Pausback is passionate about his family and outdoor recreation. He is a very enthusiastic rafter, mountain biker, skier/snowboarder, and traveler.

Tari St.Marie

7th/8th Grade Language & Literature/Humanities Teacher
Tari St.Marie joined Mackintosh Academy Littleton as the lead 5th/6th grade teacher in 2018-19. Tari earned her Masters in Education in Special Education/Gifted from the University of Missouri and her BA in Writing from San Jose State University. After 10 years of lead teaching, mostly in programs for gifted students, and three additional years in a supportive capacity at Mack, Ms. St.Marie was pleased to return “home” to the Mack community. She is the mother of three former Mack students, now adults whom she enjoys spending time with. Tari loves music and performing, crochet, and sitting in the sunshine with a good book.

Josh Onderdonk

Physical Education Teacher
Josh Onderdonk, Physical/Health Education Teacher, has a teaching license in both Physical Education as well as Health Education in Colorado. He earned his Bachelor’s Degree from Canisius College in Buffalo, New York. After graduation from Canisius, he spent a year with the Jesuit Volunteer Corps Northwest, which serves underprivileged groups in the greater Northwest United States. Josh served as a volunteer at St. Labre Indian School in Ashland, Montana. This school serves the Crow and Northern Cheyenne Indian reservations. His position was to serve as the academic support to all the high school students, as well as a substitute teacher when needed. After his year of service, he stayed at St. Labre as the PreK-8 Physical/Health Education Teacher. After three years of teaching at St. Labre, Josh moved to South Bend, Indiana (Go Irish!), where he spent the next five years teaching at Success Academy Charter School (K-5th Grade) in downtown South Bend.

When not teaching at Mack, Josh is doing something pertaining to sports or outdoor activities. He loves hiking in the mountains with his wife Sam, and takes any chance he can get to hit the links. Josh and Sam are also the proud parents of a 140 pound St. Barnard/Great Dane mix.

Christy Allen

Visual Arts Teacher
Christy discovered an interest in art at a young age and it has become one of her lifelong pursuits. She loves sharing this interest with others and learning together about the meaning behind and need for art making. She graduated with a BFA from The School of the Art Institute of Chicago, majoring in painting. Christy traveled and lived overseas  before settling down in her hometown of Denver. After seeing her youngest off to 2nd grade, she was able to pursue another passion of hers, teaching. She is a graduate of the Stanley British Primary teacher preparation program and is currently pursing her Masters of Human Development and Education from the University of Colorado-Denver. When not in the classroom you can find Christy creating children’s book illustrations, painting, hiking, reading, museum going, sitting under trees, and in the company of her three children, discovering over and over again how interesting and wonderful this world can be.

Kelly Kates

Performing Arts Teacher
Kelly Kates, Performing Arts Teacher, was born in Montreal, Canada and raised in Nigeria and Northern British Columbia. She earned a Bachelor of Music in Music Therapy degree from Sam Houston State University and a Master of Social Work degree from the University of Denver. She is very excited to share her passion for service with the students in her additional role as Service Learning/Community Service Coordinator. Kelly recently presented at the Colorado Association for Gifted and Talented Association’s conference on “The Power of Play in Helping with Anxiety and Perfectionism.”

Kelly was a counselor and teacher for ten years at Options Alternative High School, where she led the school drama, dance and choral programs. Kelly has worked as an actress and choreographer in Denver for the past twenty years, receiving recognition from the Denver Post and the Colorado Theatre Guild. She loves sharing her passion for the performing arts with children and youth. Fifteen years ago, she founded the children’s program at Town Hall Arts Center in Littleton. Before coming to Mackintosh, she taught musical theatre and tap dance for Centennial Academy of Fine Arts Education and the drama enrichment program for Wilder Elementary. Kelly and her husband live in Littleton with their two dancing daughters. She enjoys international travel with her family, and has volunteered for Habitat for Humanity in El Salvador and Canada.

Maria Cardona

World Languages Teacher - Spanish
Maria Cardona, Spanish Teacher, completed her Social Communication Degree from Pontificia Universidad Javeriana in Bogotá, Colombia and has taught in Ohio and in the Cherry Creek School District in Colorado. Maria has worked for Cherry Creek Schools both in the classroom and as a translator and interpreter. She is very passionate about languages and the Hispanic culture and loves education.  Always pursuing new challenges, Maria teaches Spanish to PreK through 8th grade students.  Maria has been part of the Mackintosh Academy community since 2010. Maria loves exploring Colorado and the Rocky Mountains.


Clara Butler

Clara Butler

Spanish Teacher & Childcare Provider
Clara Butler is our Spanish Teacher & Childcare Provider.

Alison Weems

Sustainability Coordinator
Alison Weems, Sustainability Coordinator, earned a Bachelor’s Degree in Environmental Studies (with a focus in education) from Brown University in Rhode Island. While teaching at Mackintosh for nearly 10 years, Alison was instrumental in designing and implementing our award-winning environmental programming. As Sustainability Coordinator, she monitors and maintains the numerous “green” initiatives on campus with the help of the students, staff, and parent community.  Alison has been involved in education as a teacher and tutor for 25 years. As the daughter of a US diplomat, Alison enjoys sharing her experiences traveling around the world with the IB community at Mackintosh. Outside of school, she enjoys skiing, hiking, biking, and traveling.  She is married to a rocket scientist and has two college-age children.


Val Steklac

Tech Specialist & Afterschool Childcare
Val Steklac, Tech Specialist and Afterschool Childcare, is an alum of Mackintosh Academy. They attended Mackintosh from 2001 through 2008, and have maintained a relationship with the school since. They have tutored students in math and time management, worked as a substitute teacher, and run an afterschool program dedicated to making connections and nurturing skills through tabletop games. Val studied psychology at Landmark College in Vermont, and has worked in the service industry for around 6 years.

When not diving into news around the latest computer technology, Val enjoys searching for new and exciting tabletop games to learn and share.

Stacey Anderson

Learning Specialist
Stacey Anderson, Learning Specialist, returned to Mackintosh Academy in 2018 after a three-year absence. Stacey taught at Mackintosh for nine years beginning in 2002 and then worked as an administrator at Mack for three years. Always searching for a challenge, Stacey taught part-time at Asbury Elementary in Denver for two years, working with teachers and students in grades K-5 specifically focused on interventions and accommodations to aid students in being fully engaged in their classrooms. Prior to 2002, Stacey taught in the Cherry Creek School District for 10 years, both in elementary and special education. Stacey has a Bachelor of Arts degree in elementary and special education and a Master of Arts’ degree in special education. She holds a current Colorado Professional Teaching License and was recently awarded her certification in English Language Acquisition. Her passion in education revolves around student success in accessing and engaging in learning. Spending time with her family (all three of her children attended Mackintosh – Evyn graduated from DU, Reid graduated from CU and Isabella studies at CSU) and playing tennis are her two favorite hobbies. Stacey and her husband, Wayne, spend lots of time in the mountains and are getting quite adept at navigating their newfound “empty nest.”

Anne Wolf

Learning Specialist
Anne Wolf is the Learning Specialist for our 5th-8th grade educational team. Anne has over 30 years of experience in gifted education, both in the classroom and in leadership roles. She earned her Master of Science in Education at the University of Southern California and has worked most recently as Associate Director of Curriculum at the Ricks Center for Gifted Children in Denver and the Gifted and Talented Facilitator at Arrowwood Elementary in Douglas County. Ms. Wolf collaborates creatively with our 5th/6th and 7th/8th Lead Homeroom Teachers and Curriculum Coordinator in serving the needs of our gifted middle-school-age students. In her spare time, Anne enjoys textile arts and reading.

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Mackintosh Academy Littleton