Seth Greiner, PT, MSPT
Seth built this practice around one rule: an hour of physical therapy should mean an hour with a licensed physical therapist. He still carries his own caseload.
The clinic he opened is the clinic he wanted to work in.
Seth graduated from Boston University in 2005, cum laude, earning a bachelor’s and a master’s degree. He picked up his personal training certification from the National Academy of Sports Medicine while he was still a student there, and he is a certified golf trainer through the Titleist Performance Institute. He spent the decade after graduation working hospitals, schools and outpatient clinics across the tri-state area.
That decade taught him what he did not want to build. In 2015 he started a mobile physical therapy practice in the heart of the Hamptons, driving to patients and giving each one a full, undivided hour. In 2021 he opened the Speonk clinic and kept the model exactly as it was. Quogue followed as the second location.
He is the head coach at Rock Steady Boxing Hampton Bays, a noncontact boxing class that helps people with Parkinson’s disease stay strong and independent, and he earned his certification at the original Rock Steady affiliate in Indianapolis. He has completed hundreds of hours of continuing education, most recently focused on Parkinson’s management. Seth lives in East Quogue with his wife and their two daughters, and he is a loyal Steelers, Penguins and Mets fan.
Where the approach comes from.
The short version of the background behind the hour you spend with him.
Boston University, 2005
A bachelor’s and a master’s degree earned cum laude, with a NASM personal training certification picked up along the way.
Rock Steady Boxing Head Coach
He coaches the Hampton Bays program for people with Parkinson’s disease, certified at the original Rock Steady affiliate in Indianapolis.
TPI Certified for Golf
A certified golf trainer through the Titleist Performance Institute, the certification behind the TPI golf screen offered here.
Every Age, Every Level
He works with competitive athletes, recreational weekend warriors and people exercising for the first time in their lives.
What Seth works on most.
Seth listens to the story first. He believes the account of how a problem started, what makes it worse and what you have already tried is the fastest route to what is actually failing, and that a plan built without it is a guess.
His own caseload leans toward the Parkinson’s and neurological community, golfers, and the patients who already did physical therapy somewhere else and came out the other side no better than when they walked in.
No referral needed in New York for up to 30 days or 10 visits. In network with Medicare and Medicare Advantage, out of network with most other plans, and we submit claims on your behalf. Same-week appointments are usually available at both locations.
Asking for Seth.
You can request Seth by name when you book, and whoever you start with is who you keep. There are no handoffs to an assistant or an aide here, so the person who evaluates you is the person who treats you through discharge.
If you are not sure who fits, tell us what is going on when you call and we will match you with the therapist whose focus lines up, at whichever of our two locations is easier for you.
What his patients say.
"Seth is practically a miracle worker! I am in less pain and have better range of motion than I have had in decades! Literally. This far exceeds my expectations!"Lynne J. · Long-standing pain
Schedule Your Appointment
No referral needed in New York. Same-week appointments available at both locations.
Your first visit is a full one-on-one evaluation with a licensed physical therapist: come in, tell us everything, and leave with a plan.
You’re all set.
We’ll reach out within one business day to confirm your appointment. If you need to speak with us sooner, call us directly.