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Our People

Dedicated to our patients and to the neuro rehab community.

Rehab Without Walls® NeuroSolutions team members and leaders are dedicated to serving our patients and the entire community of people with neurological injuries and illnesses. Our leaders are community advocates and board members for leading professional organizations. While we work on change at the local and national level, the real change comes with every single patient and family our teams directly serve.

Regional and national leaders


Jason M. Callaman, Executive Director, Arizona

Jason is a native of Baltimore, MD and he has been in the Valley for thirteen years. Jason lives in Central Phoenix with his wife, Felicia and their daughter, Paloma also lives in Phoenix.

Locally, Jason has worked as a physical therapist in a variety of clinical settings; however, his primary focus and interest has been neurological rehabilitation (impairments associated with stroke, spinal cord injuries, Parkinson’s Disease, traumatic brain injuries, and other nerve disorders). In addition to having a doctorate in physical therapy, Jason has a psychology (degree) background and over twenty years of healthcare-related experience and ten years of leadership experience.

Jason is committed to supporting the RWW philosophy and clinical team, establishing community partnerships, and creating an environment of best practices that lead to positive patient outcomes and program growth.


Christi Ewing, Executive Director, Southern California

Christi Ewing graduated with a master’s degree in Physical Therapy from Loma Linda University over 21 years ago.  She has served in a variety of Leadership positions in the outpatient and home and community model for more than 15 years.

Christi joined Rehab Without Walls as the Executive Director in 2020.  Her previous experience includes being a Director of Rehabilitation of a large outpatient orthopedic and neurologic clinic in Southern California, as well as Vice President of Operations, where she was responsible for operations in several outpatient locations.

As a home and community executive, she is responsible for operations and ensures the quality of care provided by an interdisciplinary team of physical therapists, occupational therapists, speech-language pathologists, social workers, recreational therapists, dietitians, and neuropsychologists, that provide comprehensive home and community neurorehabilitation in the Southern California region.


Nelson Gonzalez, Executive Director, Florida
Nelson has been an occupational therapy practitioner for over 16 years with an array of certifications and specialties including Rehabilitation Fitness Specialist, Certified Holistic Health Coach, Certified Cupping Therapist, Certified Pediatric Massage Therapist, Certified Oncology Rehabilitation Expert, and Certified Lymphedema Therapist. Nelson is the co-Chair of the Administration and Management Special Interest Section for the Florida Occupational Therapy Association. Nelson serves on the Sabrina Cohen Foundation Advisory Board as well. Nelson has presented at several national and international conferences and symposiums on topics including Chronic Stress, Intensive Therapy for the Neuro Population, Timing & Rhythm in the Brain and Body, and Autism Spectrum Disorder. As a clinician and therapy leader, he has restored function for clients and prevented/lessened disabilities following disease or profound injury including congenital dysfunctions, developmental disorders, spinal cord injuries (SCI), traumatic brain injury (TBI), acquired brain injury (ABI), cerebral palsy, paralysis, Anxiety Disorders, Autism Spectrum Disorder (ASD), Chronic Stress, etc. He has written several articles at various publications on topics that highlighted the importance of taking not only a holistic approach to treatment but a whole-person and environmental approach as well.

Georgia and South Carolina

Jennifer Litchfield, Executive Director, Georgia and South Carolina
Jennifer Litchfield is the Executive Director in Georgia and South Carolina. She holds degrees in both Psychology and business and is also a Certified Brain Injury Specialist. While in her undergrad program, she began working with individuals with autism and this continued through her Masters program. While living overseas in Germany, Jennifer began working with the military and assisting with the reintegration of soldiers as they came back from combat zones. Many of these individuals had some level of TBI. Upon returning to the states, Jennifer continued working within the field of neuro rehab and came to Rehab Without Walls on October 1, 2012, when she began the Georgia/South Carolina teams.


Scott Mayo, Executive Director, Maine
Scott earned his second Bachelor of Science Degree in Therapeutic Recreation from the University of Southern Maine in 1995; he earned his first Bachelor of Science Degree in Commercial Recreation Management from the University of Maine at Machias in 1992.

Scott has been a Certified Therapeutic Recreation Specialist since May of 1996. In 2011 he became a Certified Brain Injury Specialist. He has worked in many settings serving individuals with acquired brain injuries since 1995 including; sub-acute care centers, community and outpatient settings. In the outpatient setting he has worked as a recreational therapist, a clinical director and since 2009 the Executive Director of the Maine Center for Integrated Rehabilitation.

Scott currently serves as the Chair for the Acquired Brain Injury Advisory Council for the state of Maine.
Scott has served as the Treasurer for the Maine Recreational Therapy Association since 2012. Scott serves as the state of Maine representative for the American Therapeutic Recreation Association and supports their endeavors to achieve licensure in all U.S. states.


Tammy Goulding, Executive Director, Michigan Home and Community
Tammy holds a Bachelor of Arts Degree in Sociology for Michigan State University. She has worked in various capacities with individuals with brain injuries since 1988. She has extensive experience managing in both residential and home and community settings. In addition she has experience managing mental health insurance benefits. Tammy is a member of Coalition to Protect Auto No Fault, Michigan Brain Injury Provider Council and the Brain Injury Association of Michigan.

Michigan and Illinois

Mayra Ramos, Executive Director, Michigan and Illinois Residential
Mayra Ramos is the Executive Director for the Rehab Without Walls NeuroSolutions Residential Rehabilitation programs in Milan, MI and Downers Grove, Illinois. She has worked in the field of Brain Injury since 1991. Mayra was introduced to the field of brain injury in 1986 when her sister acquired a brain injury. Having personally walked in the shoes of the families of survivors fueled a passion for the field. Mayra’s background is in Public Health Education. She recently celebrated my 23rd year serving the brain injury population. Mayra currently sits on the board for the Michigan Brain Injury Providers Council. She is also a member of the Michigan Brain Injury Association and the Coalition to Protect Auto No Fault.

Ontario, Canada

Krista Davis, Executive Director, Ontario, Canada
Krista Davis holds a diploma in Multidisciplinary Rehabilitation from Mohawk College in Ontario Canada. Ms. Davis is certified by the American Academy of Certified Brain Injury Specialists as a Certified Brain Injury Specialist Trainer (“CBIST”) and is also certified by the Crisis Prevention Institute as a Nonviolent Crisis Intervention Instructor. Ms. Davis has been employed with Rehab Without Walls Residential NeuroSolutions, a ResCare Premier Canada, Inc. company, since 1994. During this 24-year tenure, she has held the positions of Program Director, Human Resource Director, Director of Operations and has been the Executive Director since 2000. Ms. Davis is also certified as a Management Health and Safety Representative in the Province of Ontario.


Julianne Krissinger, Executive Director, Texas Home and Community
Julianne Krissinger is a Speech Language Pathologist who earned her Masters in Speech Language Pathology from George Washington University in Washington, DC. Julianne has a variety of clinical and managerial experience across the continuum of care and the country. She found her passion for functional home and community rehabilitation for individuals recovering from brain injury as a speech pathologist and clinical coordinator for RWW before stepping in to the Executive Director role. Julianne also volunteers with Small Victories Foundation a local, Austin, non-profit that promotes physical and emotional healing for adult survivors of brain injuries by connecting them with arts experiences through professional instruction and performance/sharing opportunities.

Jane Stewart, Executive Director, Texas Residential and Texas Hill Country School
Jane has a Bachelor of Science in Health Education from Sam Houston State University, Huntsville, Texas. She is also a Certified Brain Injury Specialist. Her career began in 1987 at Tangram Rehabilitation Network. Over the past 31 years, Jane has held many positions within our organization and is now the Executive Director of our Acquired Brain Injury Residential Programs and our Texas Hill Country School, which is for children and adolescents with autism spectrum disorder and other neurological disorders.


Trina Terrion


Paul Campbell, Executive Director, Washington Home and Community
Paul has worked in the Neuro rehab field since he graduated from the University of Washington over 20 years ago with a degree in occupational therapy. He worked 8 years at Harborview Medical Center in Seattle, where he became a clinical specialist on the inpatient rehabilitation unit. He in 2006 he started a universal design consulting business and began working as an OT for Rehab Without 2009, he began working full time at the Pacific Northwest RWW and went on to serve as the Director of Clinical Management and became the Executive Director in 2015.

Paul has held certifications as an APT and CBIS during his career. He has lectured on topics including spinal cord injury, assistive technology, and universal design at a variety of conferences, symposiums, and universities. He has served on the Washington OR Assosiation board for a decade and is currently on the Green River College COTA program’s advisory board.

Michael “Mac” McCormick, Executive Director, Washington, Pediatrics and ABA
Michael McCormick (Mac) has been the Executive Director of the Rehab Without Walls BMAC program for 20 years. He received his bachelor’s degree from the University of Washington. He has 30 years’ experience as Pediatric Behavior Analyst serving children in residential, outpatient and home & community. Mac is a Washington Agency Affiliated Counselor.