Zenith Staff





Occupational Therapy

Physical Therapy

Speech Therapy

Dry Needling



The Care Providers of Zenith Rehabilitation are happy to welcome you! Please feel free to explore our listings below.

Occupational Therapists

profile image of Rhonda Mattson

Rhonda Mattson, MOTR/L, CHT rmattson@zenithrt.com

Rhonda graduated from Maryville University of St. Louis and has been practicing occupational therapy since 2010. Her credentials of CHT indicate that she has additional certification in hand therapy. Since graduating, her therapeutic experience has been varied including working inside several private practice models with services including pediatric care, adult care, and work hardening. She established the pediatric program at Lake Regional Hospital in Osage Beach and was the establishing occupational therapist at Mosaic Life Care in St. Joseph for their pediatric program. Due to this wide range in experience, she is comfortable with treatments ranging from oral motor exercises and sensory integration to custom splinting and stroke rehabilitation.

Layne Koechner lkoechner@zenithrt.com

Please join us in welcoming Layne Koechner as our new Certified Occupational Therapy Assisant!

Speech Therapists

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Alyssa DeRoos, MS, CCC-SLP aderoos@zenithrt.com

Alyssa graduated from the University of Central Missouri and has been a practicing speech-language pathologist since 2014. She is experienced with school-based populations and understands the benefits and limitations of therapy in that setting. Alyssa is confident in addressing disorders and delays in the areas of articulation, phonological processes, receptive language, expressive language, fluency, pragmatic language, and assistive technology. Her experience does also extend to older populations with treatment types including cognitive-linguistic deficits (memory and problem solving), as well as treatment of swallowing disorders.

Stephanie Williams swilliams@zenithrt.com

Please join us in welcoming Stephanie Williams as our new Speech Language Pathologist!

Physical Therapists

Kara Aaby, PT, DPT kaaby@zenithrt.com

Kara graduated from Wichita State University in 2018. She is experienced with pediatric and adult populations with diagnosis that range from orthopedic to neurologic origin, as well as general developmental delays. She is familiar with strength, mobility, balance and coordination deficits in the pediatric population that are impeding performance of age appropriate activities. Her main focus is helping to promote functional movement patterns that will enhance a child's/adult's ability to partake in everyday life.

Business Manager

profile image of Annetta Toomey

Annetta Toomey, MA aktoomey@zenithrt.com

Annetta received her Masters’ degree from the University of Central Missouri in 2010. Her deep commitment to our clientele and her experiences in working with multiple stakeholders will ensure the best business outcomes for all parties. As a patient advocate, she will interface with primary care providers, insurance companies, and claims. In addition to her extensive skill and knowledge in business management, she will arrange the professional development and community outreach efforts for Zenith Rehabilitation.