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Practitioner Profiles

Bill Kearney



Office: Riverside

Bill Kearney, C.O. opened Johnson's Orthopedic of Riverside in 1983. He has created a company where customer service and patient care is the trademark of his business. Bill directs and oversees the daily operation of all three offices. He received his education and training in orthotics from Cerritos College, Rancho Los Amigos Hospital and University of California, Los Angeles. He is a member of the American Orthotic and Prosthetic Association, California Orthotic and Prosthetic Association and American Academy of Orthotics and Prosthetics. Bill lectures yearly for the physical therapy department at Loma Linda University on Pediatric Orthotics and Prosthetics. Bill's experience includes providing custom orthotics for patients of all ages. He specializes in pediatric patients with cerebral palsy, spina bifida, osteogensis imperfecta and arthrogyposis.

Ray Diaz


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Office: Riverside, Hesperia

Ray Diaz is a Certified Orthotist with over 27 years of experience treating patients. He has worked at renowned medical institutions such as The University of California of San Francisco and San Francisco General Hospital, specializing in pediatric and adult patients. His specialty is in scoliosis bracing and trauma orthotics.

As a C.C.S. paneled provider, Ray has also provided pediatric services to clinics in the Bay Area and attended weekly orthopedic clinics with Lucille Packard's Children's Stanford Hospital in Palo Alto and Emeryville. He is passionate about positively impacting people's lives by helping patients regain their function and confidence.


  • American Board for Certification Certified Orthotist, 2004

  • California Children's Services (CCS) Paneled Certified Orthotist, 2004

  • Board for Orthotist / Prosthetist Certification, Certification Orthotics, 2003 Certified Orthotic Fitter, 1997

Andy Lindberg



Office: Riverside, Pomona & Hesperia

Andy Lindberg, CP has over 30 years of experience in the field of O&P, and has been a Certified Prosthetist since 1997. He also spent 12 years with the VA providing the highest level of Prosthetic and Orthotic care to our Veterans.

Certifications Include:

  • ABC Certification

  • C-leg, Geniuum, X2 Microprocessor Knees

  • Propio Micropocessor Foot

  • Pile Microprocessor Knee

Andy brings a dedication and passion to providing the best patient care and we are excited to have him on the team. 

Jan Krzeminski



Office:  Hesperia

Jan Krzeminski, C.O. joined Johnson's Orthopedics in 1997. He is in charge of operations for our Hesperia Office. He began working in the orthotics field in 1976. He received his education and training in orthotics from University of California, Los Angeles and Long Beach VA Hospital. Entering the field he felt great satisfaction designing and developing systems to enhance patient function. Jan continues to develop new types of orthotic designs to work in neurological rehabilitation and is also working with state of the art orthopedic control systems (DBS). These DBS systems enable patients to walk, run and perform functional activities which otherwise would not be obtainable with conventional orthotics. Jan's scope of practice is adult and pediatric custom orthotics. He specializes in patients with spinal cord injury, stroke, partial paralysis, CMT, post polio and traumatic brain injuries.

Kevin Taylor



Office: Pomona & Riverside

Kevin Taylor, CO. joined Johnson's Orthopedic in 1998. He is in charge of operations for our Pomona Office. He began his orthotics career in 1993. He received his degree in Kinesiology from California State University Northridge. He received his orthotics education and training from Northwestern University. Kevin has experience working with pediatric, adult and geriatric patients. He specializes in working with children with cerebral palsy, spina bifida and other neurological conditions providing custom bracing for both the pediatric and adult population.

Melanie Berg



Office: Riverside, Pomona, & Hesperia

Melanie Berg, CO, CPA, CFm joined Johnson's Orthopedic in 2011. She received a BS degree in Physiology from California State University Fresno. Her orthotics and prosthetics education and training were completed at California State University Dominguez Hills. She began working in the field in 2000. Melanie's experience includes working with patients of all ages from pediatrics to adults and geriatrics. Her specialties include cranial helmets for babies with positional plagiocephaly, scoliosis bracing for adolescents and post mastectomy fittings for women. Melanie enjoys educating her patients to help them understand the process that they are going through as well as the benefits that they can expect.

Hector Ruvalcaba



Office: Riverside 

Hector Ruvalcaba, BOCP joined Johnson's Orthopedic in 1990. He has been working in the orthotic and prosthetic field for 31 years. He began his career in a technical position where he trained in fabrication and assembly of orthotic and prosthetic devices. The technical training inspired him to pursue the clinical aspect of the practice and he became BOCP certified in 2007. Hector has experience in orthotics and prosthetics with patients of all ages from pediatrics to adults and geriatrics. He is bilingual and assists our Spanish Speaking patients. *Se habla espanol

Fred Callihan



Office: Riverside

Fred Callahan, CO. joined Johnson's Orthopedics in 1986. He began his career in a technical position as a Bench Technician and Lab Manager. His technical training inspired him to pursue the clinical aspect of the practice. In 2004 he became American Board Certified in Orthotics. Fred's experience includes working with patients of all ages from pediatrics to adults and geriatrics providing a wide range of orthotic services.

Catia Bleck

MSOP Board Eligible


Office: Riverside, Pomona & Hesperia

After performing excellently for her clinical rotations and externship, Catia joined our Clinical Team at Johnson's Orthopedic.  She graduated from Loma Linda University in March 2021 with a master's degree in Orthotics and Prosthetics.

Catia received her bachelor's degree in healthcare Management from DeVry University Pomona in 2015.  She is fluent in English, Portuguese, and Spanish. 

Caroline Leach

CO, Prosthetic Resident 


Office: Riverside & Hesperia

Caroline received her master's degree in Orthotics and Prosthetics from Loma Linda University and is currently pursuing her 24-month NCOPE Residency with us.  Prior to entering into the field of O&P she served in the U.S Navy for 5 years on the USS Nimitz aircraft carrier where she worked as an Aviation Ordnanceman while also receiving training in Advanced First Aid and Rescue.  Caroline is very passionate and eager to apply her knowledge and skills towards helping our patients receive the best possible care during her residency. 

  • American Board for Certification Certified Orthotist, 2024

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