Seth Greiner, PT, MSPT
Founder, Owner & Physical TherapistLaunched the practice as a mobile clinic in 2015, opened Speonk in 2021, and coaches Rock Steady Boxing Hampton Bays.
”My knee pain is totally gone.”, Mindy Z.
”No one compares to Greiner PT.”, John S.
”Less pain and better range of motion than I have had in decades.”, Lynne J.
”One on one training, practitioners who listen and invite feedback.”, Sheryl D.
”Full attention and focus on improvement during entire session.”, Diane H.
”The physical therapists at Greiner are the best I have ever worked with.”, Laurie C.
”Systems for home excercise are top notch.”, Richard G.
”A wonderful job helping me before and two months after knee surgery.”, Jorge B.
”My knee pain is totally gone.”, Mindy Z.
”No one compares to Greiner PT.”, John S.
Why Patients Switch to Greiner Physical Therapy
Being handed to an aide is not treatment.
Most clinics run three or four patients at once, and the person who actually works on you is whoever happens to be free. Seth Greiner spent a decade inside that model before he left it in 2015. Here is what he built instead.
The Typical Clinic
What most patients put up with
- An aide runs your exercises
You booked a physical therapist. You spend most of the hour with someone else entirely.
- Three or four patients at once
Your therapist is in the room, just not with you. Nobody is watching how you actually move.
- Half the session on a machine
Hot packs and e-stim fill the time while the reason you are in pain goes unexamined.
- The same printout everyone gets
Two people with the same diagnosis walk out with the same sheet, and neither one fits.
- It flares again in six months
Nothing was rebuilt, so the tissue that failed the first time fails again.
The Greiner Physical Therapy Way
What actually gets you better
- No assistants, no aides
Your whole session is with a licensed physical therapist. That is the practice, not a promotion.
- The same therapist every visit
They know your case cold, so progress compounds instead of restarting at the front desk.
- Hands-on work, then loading
Manual therapy to change what is restricted, then real strength work so the change holds.
- A program built for your body
Two people with the same injury get two different plans, delivered through an app you actually use.
- A four-phase path with an end point
Pain, Prime, Prevent, Perform. The goal is discharge, not a standing appointment.
300+ reviews and a 5.0 rating on Google say this is not just philosophy. Come see it.
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What Patients Are Saying
Real outcomes.
Real outcomes.
Real neighbors.
These are unedited Google reviews from patients across the Hamptons: knee and hip replacements, spines, shoulders, and pain that other clinics had already given up on. Read what actually happened.
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5.0 · 300+ reviews on Google
Our Approach
Listen. Treat. Rebuild.
No two people are the same, so no two plans are either. Here is what every course of care at Greiner has in common.
Step 01 · Listen First
01
Listen first.
Your first visit starts with your story, not a clipboard. What you were doing, what changed, and what you are trying to get back to, before anyone puts a hand on you.
02
Treat by hand.
Hands-on manual therapy goes after the joint or tissue we actually found, not wherever it happens to hurt that morning. The same therapist does it every visit.
03
Rebuild capacity.
Then we load what failed until it is stronger than it was before. That is the part most people never get to, and it is why their pain comes back.
Our 4 Phase Recovery Program
A clear path from your worst day back to your best.
Every plan at Greiner runs through the same four phases. You always know which one you are in, and what has to be true before you move to the next.
Phase 01
Pain
Get you out of crisis. Hands-on work to calm the irritated tissue and give you back movement you can trust, so you can sleep and get through a day.
Phase 02
Prime
Restore the motion and the control the injury took away, and correct the movement habits that loaded the wrong tissue in the first place.
Phase 03
Prevent
Build the capacity that keeps it from happening again, and hand you a home program you can run on your own without thinking about it.
Phase 04
Perform
Get back to the thing you actually came in for. The golf swing, the run, the boat, the grandkids, the barbell, whatever your version of it is.
What We Do
Twenty-eight services, one model.
Everything below is delivered the same way: one patient, one licensed therapist, the whole session.
01
One-on-One Physical Therapy
The foundation of everything here. A licensed physical therapist evaluates you, treats you, and progresses you, from the first visit through discharge. No assistants, no aides, no handoffs.
- The same licensed therapist every visit
- Hands-on treatment, then real loading
- No referral needed in New York
02
Manual Therapy
Hands-on joint and soft tissue work to change what is actually restricted.
03
Sports Rehab
Return to your sport with the capacity to stay in it, not just clearance.
04
Golf Performance
A TPI 16-movement screen, launch monitor work, and a plan for your swing.
05
Parkinson's Boxing
Rock Steady Boxing for Parkinson's, coached by our founder.
06
Balance & Fall Prevention
Get steady on your feet again, including a look at your home setup.
What We Treat
If it is keeping you from moving, we treat it.
Twenty-nine conditions, from a first twinge to pain you have carried for years, including the neurological work most clinics out here do not do.
Spine & Nerve
Shoulder, Arm & Hand
Hip, Knee & After Surgery
Neurological & Balance
Sport & Training
By the Numbers
Every number here is one you can check.
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0+Google Reviews
0Licensed Therapists
0Hamptons Locations
Meet the Team
Whoever evaluates you is who treats you.
Seven licensed physical therapists, and three people at the front desk who know your name before you finish saying it.
Dr. Peter Imperato, PT, DPT
Physical TherapistStony Brook graduate with a post-doctorate certification as an orthopedic manual therapist, and the voice behind our Spotlight Series.
Dr. Anthony Fuentes, PT, DPT
Physical TherapistLicensed as a PTA in 2018, earned his doctorate at Stony Brook in 2023, and gets named by name in our post-surgical reviews.
Patient Stories
Straight from Google, unedited.
Common Questions
Everything worth knowing before you come in.
01 / Do I need a referral to start physical therapy?
No. New York has direct access, which means you can see a licensed physical therapist without a doctor’s referral for up to 30 days or 10 visits, whichever comes first. Most of our patients start exactly that way. If your plan turns out to require a referral, or you reach that limit and want to keep going, we tell you before it becomes a billing problem and help you get one.
02 / Will my insurance cover treatment?
Here is the straight version. We are in network with Medicare and Medicare Advantage. With most other plans we participate as an out-of-network provider, and we submit the claims on your behalf so you are not the one chasing paperwork. We do not accept Medicaid. Send us your insurance details before your first visit and we will verify your therapy benefits and give you an estimated cost, so nothing arrives as a surprise.
03 / What should I expect at my first visit?
A licensed physical therapist takes your full history, watches how you actually move, works out where the problem is coming from, and explains it in plain language. Not an aide, not a clipboard, and not ten minutes before someone hands you a printout. You leave with a plan and an answer to the question you walked in with, which is usually some version of “why does this keep happening?”
04 / How long are sessions and how often will I come in?
Sessions run 30 to 60 minutes depending on your condition, one-on-one with the same therapist each time. Most people start at two or three visits a week for at least four to six weeks, then taper as they improve. You get a realistic estimate after your evaluation. We would rather discharge you than keep a standing appointment on the books.
05 / How soon will I feel results?
That depends on what is wrong and how long it has been wrong, and anyone quoting you a number before examining you is guessing. What we will commit to: we measure how you move at every visit instead of only asking how you feel, and if the plan is not producing a change, the plan changes. You will not spend twelve visits on something that stopped working after four.
The Longer You Wait, the Harder It Gets
Are you still waiting for it to go away on its own?
It has been a while now. One evaluation with a licensed physical therapist tells you what is actually wrong, roughly how long it takes to fix, and what the plan looks like. No referral needed, and booking it commits you to nothing.
Start Your Recovery
Stop managing it.
(631) 596-5096
Stop managing it.
Start fixing it.
No referral needed in New York
In network with Medicare and Medicare Advantage, claims filed for you
Same-week appointments at Speonk and Quogue
Every session one-on-one with a licensed PT
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Google Rating
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Google Reviews
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Hamptons Locations
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We’ll reach out within one business day to confirm your appointment. If you need to speak with us sooner, call us directly.
Find Us
Two clinics in the Hamptons.
Speonk, NY
Greiner Physical Therapy · Speonk
Mon, Wed, Fri 9:00am – 7:30pm · Tue, Thu 7:00am – 7:30pm
Quogue, NY
Greiner Physical Therapy · Quogue
Mon, Wed 9:00am – 7:30pm · Tue, Fri 8:00am – 6:30pm · Thu 7:00am – 7:30pm