About Us

As a husband and wife team, Randy and Heidi Stewart launched Blue Horizon Therapy in the summer of 2011 with the mission to provide exceptional child centered care to families in the Southwest Denver area. Combining Randy’s sales management experience and Heidi’s clinical experience as an Occupational Therapist, the husband and wife team have steadily grown Blue Horizon Therapy together. Our daily goal is to establish and maintain relationships with our clients, their families, and payers of services while providing exceptional care that is client driven and focused on independence.

Randy Stewart

CEO and Owner

Randy Stewart and his wife, Heidi founded Blue Horizon Therapy, LLC in 2011. Randy was born and raised in the Pacific Northwest where he was an avid steelhead fisherman and raced motorcross. He received an Associates Degree in 1989 from Universal Technical Institute in Automotive and Diesel Technology and has worked predominantly in the industrial and manufacturing fields in sales and management. After 22 years in those industries, Randy decided to go into the outpatient healthcare business with his wife. Randy enjoys golfing, fishing, and bow hunting. He lives with his family and several pets in the Roxborough area of Littleton, Colorado.

Heidi Stewart, M.Ed., OTR/L

Clinical Director and Owner

Heidi Stewart and her husband, Randy founded Blue Horizon Therapy, LLC in 2011. A native of Colorado, Heidi left her home state to attend Pacific University in Forest Grove, Oregon where she graduated in 1994 with a Bachelors of Science in Occupational Therapy. Heidi worked for 5 years as a pediatric Occupational Therapist in a local school district in the Portland metropolitan area while also occasionally working weekends in acute care psychiatry at St. Vincent’s Hospital. In 2000, Heidi moved back to her home state with her husband. Since her move back to Colorado, Heidi has worked at Children’s Hospital, Elizabeth School District, and Douglas County School District. In 2011, Heidi completed her Masters of Education with an emphasis on Autism Education from Regis University. Heidi enjoys reading, hiking, and most of all spending time with her husband, Randy and their two children.

Monica Ritzdorf, COTA/L

C.O.T.A (Certified Occupational Therapy Assistant)

Monica graduated from St. Mary’s College in Minneapolis, Minnesota in 1985. She was previously an undergraduate student in Special Education at St. Cloud State University in Minnesota. Monica has over 38 years of Occupational Therapy experience and has been working in the pediatric field since 2000. She has worked in the public school system for 20 years, and prior to that worked in the field of adult physical rehabilitation. Monica has a passion for providing children with all levels of abilities a fun and caring environment to reach their specific goals. She has two grown boys, lives in Highlands Ranch and enjoys hiking, paddle boarding and traveling.

Sarah E. Yost, OTD, OTR/L

Occupational Therapist

Sarah is a Registered and Licensed Occupational Therapist in Colorado. She earned her Doctor of Occupational Therapy from Washington University School of Medicine in St. Louis, MO, in 2013. Her research focus was Participation Factors in Children who are Deaf and Hard of Hearing. Sarah received her ADHD Clinical Services Provider Certification in 2020. She received her Lactation Counselor Certification in 2021. Sarah’s clinical work experience includes outpatient pediatrics, lactation counseling, and early intervention. Sarah is passionate about children and has worked with children of all ages and abilities. She enjoys hiking and biking with her husband and two kids, and just being in the Colorado sun!

Mallory Bigler, B.A.

Speech Language Pathologist Assistant

Michaela Smith COTA/L

C.O.T.A (Certified Occupational Therapy Assistant)

Michaela earned her Associate’s Degree of Applied Science in Occupational Therapy in Denver at National American University. She previously received her Bachelor’s Degree in Sports and Exercise Science at the University of Northern Colorado. She obtained a Clinical Cancer Exercise Specialist certification at the University of Northern Colorado Cancer Rehabilitation Institute where she worked with cancer patients to fight the toxicities from their cancer treatment, and help with them get back to the things they love to do most. Michaela believes that creating an environment that is fun, empathetic, and open helps create a bond with both the children and their families where everyone can flourish. In her spare time, she enjoys hiking with her dog Tobin, reading a good book, and traveling.

Breann Vander Molen PT, DPT

Pediatric Physical Therapist

Breann Vander Molen is a Pediatric Physical Therapist that earned her Doctorate in Physical Therapy from Regis University, after receiving a Bachelors of Science in Kinesiology from California State Long Beach. She has advanced training in Torticollis rehabilitation and places a heavy emphasis on neuro-rehabilitation in her treatment sessions. She values providing family centered care and serving her client on an individual level to ensure that they feel valued and prioritized.

When not at the clinic, you can find Breann and her husband Chad on the golf course or waking their yellow labrador puppy.

Robin Kessel MS, CCC-SLP

Speech-Language Pathology and Audiology

Robin graduated from the University of Oregon with a BA in Speech-Language Pathology and Audiology, followed by a master’s degree in Communication Disorders and Speech Sciences from the University of Colorado-Boulder. Robin is a licensed speech language pathologist in the state of Colorado and holds a Certificate of Clinical Competence from the American Speech Language Hearing Association. Her clinical experience includes 30+ years evaluating and treating communication disorders, primarily with preschool and school-age children, in public school and private practice settings. Robin and her husband live in Littleton and have two adult children. Her favorite leisure activities include baking, reading, and watching sports.