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*WE ARE HIRING* Looking for evening and weekend DPT.
4pm-8pm week days, and 7am-12pm Saturday.
Fax Resume to (631) 284-9260


8 months ago
Just finished therapy on Dec. 17th 2021. Dr. Mantas is the best, hands down! I had a damaged femoral nerve from surgery and could not walk. I began my therapy with a leg brace and a walker. After six months I walked out of the office without a cane, and I am walking better every week, just as Dr. Mantas said I would. The therapy was intense for months, but so worth it. He really cares about everyone he is helping and you will get his personalized attention. His helper Patti is the best also. I really miss them and am so grateful to Dr.Mantas for his help and excellent care! Laraine Phillips
- Richard P
5 years ago
I have gone to Mantas for 2 rotor cuff surgeries, and now a torn hip labrum surgery. First I don't mind going there, its like a family. Such comfortable surroundings. Joanne the receptionist is totally friendly, knowledgeable, and caring. No question is stupid, and Mantas will let you know in detail what is being done. If you listen to him, do your homework, you will get better! He is also willing to help you meet healthy goals in your lifestyle. Mantas and Joanna are not just my PT people, I consider them friends!
- Karen T
4 years ago
Since 2003, I have been going to PT on an ongoing and regular event. I suffered a serious injury in 2003 and since have had many surgeries do to severe arthritis I have been to Therapists from western Long Island to Eastern Long Island. Most have been good to very good. Usually they start out good and caring but as time progresses you are left to do it on your own as they take in more patients. That is until I met Mantas. For the first time I can say I actually felt like I really mattered. From start to finish; his level of care was fantastic and I never doubted him once. The place is clean with very professional equipment run at the highest standard. I have such faith and trust in him that I have refered many people to him including my wife.
- Paul S

The Difference In Quality of Care

Welcome to OneOnOnePT, PLLC. A practice of personalized and individual health care. We are a company dedicated to providing custom-tailored care to an assortment of injuries and age groups. We offer versatile health care delivery methods to assess and care for your health needs.

Advancement of physical performance to reveal the very best in each and every client is our personal goal and mission statement. We strive to be a reputable and renowned source for personalized education, training, and preservation of one’s body through the utilization of recent publications, science, technology, and applied expertise.

Mantas Korsakas, DPT Founder of OneOnOnePT, PLLC., Is a Licensed and Insured Doctor of Physical Therapy.

Stony Brook University:
• Doctor of Physical Therapy, June 2007
• Bachelor of Science, May 2004

• PI Alpha Sigma, Phi Theta Kappa International Scholastic Order, Dean's List, National Vocational Technical Honor Society, Who’s Who in American Colleges.

FIRST AID/CPR/AED Certification:
• Current, Annually Re-Certified.

Clinical Experience:
• Peconic Bay Medical Center: Acute Care/Adult Rehabilitation.
• St. Charles Outpatient Rehabilitation: Orthopedic/Adult Rehabilitation.
• St. Charles Hospital Outpatient Community Re-entry Program: Neurological Rehabilitation.
• North Fork Physical Therapy: Orthopedic Outpatient Rehabilitation.
• Sports Therapy East Hampton: Orthopedic, Neurological, TMJ, TBI, CVA, Strengthening/Conditioning, Gait-Balance Disorders, Adult Rehabilitation.
• Home Physical Therapy.

Currently Employed:
• OneOnOnePT, PLLC: Outpatient Physical Therapy, Orthopedic, Neurologic, Geriatric, Gait/Balance Disorders, others.

Continued Education Certifications:
•  Orthopedic Excellence: The Spine 
•  Orthopedic Excellence: The Upper Quarter
•  Orthopedic Excellence: The Lower Quarter
•  Vestibular Rehabilitation 
• Maitland-Australian Physiotherapy Course Work:
• MT-1 Peripheral Course
• MT-2 Spinal Course
• MT-3 Intermediate Spinal Course
• MT-4 Differential Assessment and Clinical Reasoning
• MT-O Evidence Based Orthopedic Diagnostic Evaluation  

Specialized Treatments:

  • BPPV: Vertigo/Vestibular Disorders
  • TMJ: Temporomandibular Dysfunctions
  • Breast Cancer: Post-Surgical Aftercare, Scar/Lymph Care
  • Spine Clinic: Herniations, Fractures, Compressions, Shifts, Scoliosis, Fusions, Laminectomies
  • Joint Replacement Aftercare for: Shoulders, Hips, Knees, Ankles, Fingers
  • Hand Therapy: Tendon Gliding, Carpal Tunnel, Joint Replacement
  • Neurological: Strokes, MS, Cavernomas, Chiari Aftercare, Dynamic Nerve Flossing, Brachial Plexus Neuritis, Radiculopathies, Sciatica, Thoracic Outlet, Neuropathies
  • Gait and Balance Clinic with BIODEX Equipment
  • Amputations: Prosthetic Rehabilitation
  • VIP Direct Private Sessions ($500/hr) Limited Availabilty Call to Schedulle

We are a participating provider in multitude of insurances, please call and inquire if we accept yours. 
No Insurance? No Problem, Flat fee of $50/per visit.  
12+ Years of Experience, 100+ Health Grades Reviews
1 Office, 1 PT, 1ON1.

Contact Us


Call now
  • (631) 284-9258


Get directions
1149 Old Country Road Suite A-2
Riverhead, NY 11901

Opening Hours

Mon:7:00 am – 4:00 pm
Tue:7:00 am – 4:00 pm
Wed:7:00 am – 4:00 pm
Thu:7:00 am – 4:00 pm
Fri:7:00 am – 1:00 pm
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