Karin Hessellund Warner, MOT OTR/L worked as an occupational therapist for 24 years. In her well-rounded career, Ms. Warner worked at Rady Children's Hospital, in public and charter schools, and pediatric home health. Also, she owned a private clinic, Warner Pediatric Therapy, for 9 years. To add to her experience as a clinician, Ms. Warner obtained her Sensory Integration Praxis Test Certification over 10 years ago. Her education includes a bachelor's in psychology from the University of Oregon and a master's in occupational therapy from Samuel Merritt University.

Early on in her career, Ms. Warner became interested in ocular motility and was trained by various optometrists on ocular motor exercises and ocular motor behaviors. In the San Diego Unified School District, she was part of a panel of occupational therapists and optometrists that created a plan for improving eye health in the schools. This led to an invitation to publish an article in Behavioral Aspects of Visual Care, titled "Understanding Occupational Therapy's Role in Sensory Integration: Identifying and Describing How Sensory Processing Disorders Affect Vision and Behavior", and to speak at California's Regional Vision Therapists Forum.

As a speaker and presenter, Ms. Warner has traveled to over 15 states to instruct seminars on handwriting, visual skills, laterality, and hand development. In 2007, she was invited to speak at the Occupational Therapy Association of California's Spring Symposium, where she first presented the "Solving the Handwriting Puzzle" program. In 2021, she was invited to speak at the Occupational Therapy Association of California's Annual Conference on "Functional Vestibulo-Ocular Skills in The School Setting".