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Merrick Office: (516) 223-4300
  Greenlawn Office: (631) 261-6680

We Care About Our Patients

Our Professional Staff

William Ryan, physical therapist for Merrick and Greenlawn Long Island NY

William J. Ryan, PT founded this practice in 1988. He is a graduate of Hofstra University where he earned a Bachelor of Science Degree in education in 1980, graduating with honors. He continued his education at Hunter College where he received a Professional Certificate in Physical Therapy in the Fall of 1982. He was licensed to practice as a Physical Therapist in March of 1983. Bill has nearly 30 years of experience and has been proudly serving the Merrick community for the past 24 years. Bill and Maryfrances, who is also a Physical Therapist and works part-time in the practice, have two children and live in Mineola.




Joseph Ruisi is a sport and physical therapist for Nassau and Suffolk Counties

Joseph M. Ruisi., PT, MA has been a physical therapist at this practice since 1998. He is a lifelong Merokian and a graduate of Sanford H. Calhoun high school. He attended Gettysburg College where he studied Health and Physical Education/ Allied Health Sciences and played baseball for the Bullets. Joe went on to Physical Therapy Graduate School at Trinity College Dublin where he graduated with honors. He attributes his strong belief in a 'hands on approach' to rehabilitation from his European training which focuses on manual therapies. Joe and his wife Christina (who is a part time physical therapist in the practice) reside in Greenlawn with their three children. Joe was recently nominated for the Merrick Chamber of Commerce "Professional of the Year" award.



James Roberts is a physical therapist for Bellmore, Massapequa, Huntington and Northport NY

James R. Roberts PT, MS
James has been a physical therapist since 1999, working first in a hospital based acute rehabilitation facility with adult population including neurologic, orthopedic, and amputees at Brunswick Hospital Center.  In 2001, he started work in outpatient physical therapy, working for two years as a therapist and assistant director at Island Sports PT.  In 2003, James returned to William Ryan Physical Therapy, which has become Merrick Physical Therapy.  In 2010, James became a partner in the company, treating pediatric and adult orthopedic and neurologic conditions with hands on manual therapy.  James grew up in Merrick, and was a volunteer firefighter for 8 years in the community.  He now lives in Dix Hills with his wife Jeannine and their two children. 



David DeFilippis is a PT practicing in Centerport, Dix Hills, Wantagh and Hempstead NY

David DeFilippis, PT, DPT is a lifelong Merokian and a graduate of Calhoun High School. David graduated from New York Institute of Technology in 2007 with a Doctorate degree in Physical Therapy. David has worked in various settings both prior to and after graduation gaining experience with Acute Care, Orthopedic, and Sport Specific Rehabilitation. Continued education courses include ACL Rehab, Shoulder and Rotator Cuff Rehab, as well as Functional Training. David is working toward getting his certification in Active Release Techniques. David is a current member of the APTA.




Chris Voltmer offers physical theray and sports injury therapy for Merrick and Greenlawn NY

Christopher Voltmer, PT, DPT has been practicing physical therapy since 2008, after graduating top of his class at NYIT. His experience includes acute care, inpatient rehabilitation, homecare services, and outpatient services in a variety of settings. Christopher has been an adjunct professor at NYIT in Old Westbury and Touro College in Manhattan since 2010 in both Neurology and Kinesiology classes. He is currently studying for his Neurology Certified Specialist examination. Christopher's professional goals include receiving a certification in Manual Therapy by 2016.


Covering Therapists

Christina Ruisi PT, MA