Seth Greiner
PT, MSPTFounder and owner, Boston University 2005, head coach at Rock Steady Boxing Hampton Bays and TPI certified for golf.
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Our Team
Our Award-Winning Team in Speonk and Quogue, NY
Seven licensed physical therapists, a front-of-house team who make the logistics disappear, and a 2025 Best of the Best award from Dan’s Papers.
How We Work
The same rule applies to every therapist on this list.
You get one therapist. They evaluate you, they treat you, and they are the person in the room for the whole session. No assistants, no aides, and no getting handed off to whoever is free after ten minutes on a table.
That is the model Seth Greiner started with in 2015, when the practice was one therapist driving to patients across the Hamptons. It survived the move into a building in 2021 and the opening of the second location in Quogue, because it is not a marketing line here, it is how the schedule is built.
Every therapist on this page holds a New York license and carries their own caseload. Several of them, in their own words, said the one-on-one model is why they wanted the job.
Providers
Your licensed physical therapists.
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Dr. Anthony Fuentes
PT, DPTIn physical therapy since 2012 with a Stony Brook doctorate, and the therapist post-surgical patients name in their reviews.
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Dr. Peter Imperato
PT, DPTAn orthopedic manual therapist who works with his hands and explains the mechanism as he goes.
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Dr. James Policastro
PT, DPTDrawn to neurological, balance and pain cases, treating through movement education and strengthening.
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Dr. Matt Messner
PT, DPTA physical therapist and certified strength and conditioning specialist who runs return-to-sport progressions for athletes.
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Dr. Eamon Reagan
PT, DPTTrained across outpatient orthopedics, neurologic rehab and subacute care, with a focus on balance and back pain.
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Dr. Jack Calisi
PT, DPTThe physical therapist at our Quogue location, treating orthopedic cases with a focus on hips and shoulders.
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Front of House
The people who handle everything that is not treatment.
Scheduling, benefit verification, records and paperwork. None of them treat patients, and all three of them make your plan of care easier to keep.
Ashley Yens-Markland
Office ManagerRuns the office, verifies benefits, and finds you appointment times you can actually keep.
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Nick Semack
Patient Care CoordinatorBooks appointments, keeps records straight, and helps with insurance and payment questions.
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Jenny Alvarenga Chucuy
Patient Care CoordinatorHandles intake and scheduling, and will walk you through the online forms if they give you trouble.
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Patient Story
What our patients say.
"The physical therapists at Greiner are the best I have ever worked with. I feel extremely fortunate to be able to go there for care. I have improved greatly!"Laurie C. · Google review
Start Your Recovery
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.
Prefer to call?
(631) 596-5096
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.