Meet Our Team

  • Dr. Jeanna-Marie Barsamian, PT, DPT, OCS, ATC, CSCS

    Dr. Jeanna-Marie Barsamian, PT, DPT, OCS, ATC, CSCS

    Clinical Director

    • Graduate of University of Southern California Doctoral Program for Physical Therapy (DPT)
    • Northeastern University BS in Athletic Training (ATC), Magna Cum Laude
    • Orthopedic Clinical Specialist (OCS) 2005, 2015
    • Certified Strength & Conditioning Specialist (CSCS)
    • Clinical Center Coordinator of Education (CCCE)

    Dr. Jeanna-Marie Barsamian is the Clinical Director as well as the Clinical Center Coordinator of Education for physical therapy students at OSS Physical & Hand Therapy. In 2019, she received “Clinical Educator of the Year” from USC (the #1 Physical Therapy Program in the country) for her work and dedication in mentoring physical therapy students. Dr. Barsamian received her Doctor of Physical Therapy (DPT) degree from the University of Southern California in 2003 and followed this with a 12-month manual therapy course to further her orthopedic skills. She completed her undergraduate studies in Athletic Training at Northeastern University in Boston. She is certified by the ABPTS as an Orthopedic Clinical Specialist in addition to holding credentials as a Certified Athletic Trainer and a Certified Strength and Conditioning Specialist. In addition to her extensive experience providing medical expertise to high school and college sports, including football, Dr. Barsamian has contributed her skills to sporting events such as the Boston Marathon and the National Olympic Gymnastics Tournament. She regularly attends courses throughout the year to advance her skills in areas such as Functional Manual Orthopedics, Back Education Training, Kinesio Taping, Gait for Pain Relief, PNF, Integrative Training for the Millennium and Mulligan manual therapy. Her practice emphasizes functional and sports-specific training integrating both trunk stabilization and manual therapy techniques for patients with pain, injuries, or post surgical rehabilitation. She believes in integrating functional exercise and manual therapy techniques to achieve the most optimal outcome for her patients, all while practicing evidence-based techniques. Dr. Barsamian is a member of the APTA, NATA, and NSCA. Having played competitive volleyball, basketball, and crew in college, she currently stays active with spin classes, boot camp workouts, weight training, swimming, kayaking, snorkeling, hiking and traveling.

  • Dr. Brandon Hsu, PT, DPT

    Dr. Brandon Hsu, PT, DPT

    Staff Physical Therapist

    Dr. Hsu graduated from Johns Hopkins University in 2014 where he majored in Molecular and Cellular Biology and minored in Psychology. During his first semester of college, he was diagnosed with Acute Lymphoblastic Leukemia (ALL). While undergoing treatment, he experienced chemotherapy-induced encephalopathy and was unable to move or talk when he woke from a medically-induced coma. It was after going through extensive rehabilitation where he found his passion for Physical Therapy. Brandon then earned a Doctorate of Physical Therapy in 2018 from the University of Southern California and graduated with honors. He has been involved with a variety of clinical settings including orthopedics, ICU and cardiopulmonary inpatient care, and pediatrics. During his spare time, he enjoys resistance training, watching Youtube videos, and listening to a variety of music. He hopes to participate in a physique bodybuilding competition in a few years. At OSS Physical and Hand Therapy, Brandon hopes to motivate and help his patients achieve their goals just as his therapists did for him.

  • Dr. Naeiri Khachkian, PT, DPT

    Dr. Naeiri Khachkian, PT, DPT

    Staff Physical Therapist

    • Doctorate Degree in Physical Therapy (DPT), California State University of Northridge, 2017
    • Bachelor of Physical Education and Sport Science, Alzahra University of Iran, 2009

    Dr. Khachkian graduated with a bachelor of Physical Education and Sport Science from Alzahra University of Iran, where she was a team member of the university’s track and field team as well as Physical Education Department committee. She actively participated in rehabilitation and recovery of her fellow teammates during the Armenian Community League and has volunteered as a movement expert in schools educating parents and students about developmental milestones and proper body mechanics.

    She received her Doctorate of Physical Therapy in 2017 from California State University, Northridge and was granted the Campanella and Dodgers Foundation Scholarship showcasing her exceptional leadership and clinical abilities. Throughout her time in CSUN’s DPT program, she actively participated in various volunteer projects on and off campus including CSUN’s annual symposium for health care providers community members living in prosthetics, Japanese physical therapy student workshop, and Crescenta Valley High School Basketball Team Prehab. She completed three internships in different settings where she worked with varying population from infants to geriatrics.

    Dr. Khachkian is fluent in Armenian and Persian. In her free time, she enjoys participating in various activates including lifeguarding, teaching swimming lessons, running and fitness training.

  • Dr. Abby Merrin, PT, DPT, ATC

    Dr. Abby Merrin, PT, DPT, ATC

    Staff Physical Therapist

    Dr. Merrin earned her Bachelor of Science in Athletic Training in 2016 and Doctor of Physical Therapy in 2018 through an accelerated dual degree program at Boston University. During undergrad, Dr. Merrin completed several athletic training clinical affiliations at high schools and colleges in Boston. In addition, she studied physiotherapy in Dublin, Ireland for a summer where she specialized in treating patients with chronic spinal conditions and worked with the University College Dublin’s Men’s Soccer team. She also volunteered in the medical tent at multiple Boston Athletic Association events, including the 2015 Boston Marathon. While pursuing her physical therapy degree, Dr. Merrin worked as an Athletic Trainer at Boston Public Schools and Boston College. Throughout school, she participated in clinical affiliations in several different settings, ranging from orthopedics to neurology. She has experience providing work rehabilitation services and on-site ergonomic evaluations at LL Bean Employee Health in Freeport, Maine. In addition to her sports specialty and following a rotation at Eisenhower Medical Center, Dr. Merrin developed a strong interest in helping older adults start and maintain an active lifestyle to recover from orthopedic health conditions. Dr. Merrin is a member of the APTA and NATA. In her free time, she enjoys hiking, fitness training, and trying new restaurants and cuisines. Dr. Merrin grew up in the Los Angeles area and is excited to return home to the west coast to join OSS Physical & Hand Therapy.

  • Dr. Adam “AJ” Kessler, PT, DPT, CSCS

    Dr. Adam “AJ” Kessler, PT, DPT, CSCS

    Staff Physical Therapist

    • Doctor of Physical Therapy (DPT), University of Southern California, 2018
    • Bachelor of Science (BS) in Exercise Science, Elon University, 2014

    Dr. Kessler received his Bachelor of Science degree from Elon University, where he also studied Spanish and Public Health. While in undergrad, he participated in biomechanical research at Elon’s school of Physical Therapy. After completing his degree, he returned to his hometown of Bethesda, MD where he worked as a physical therapy aide in an outpatient orthopedic clinic, as well as personally training several clients at a local gym. Dr. Kessler received his Doctor of Physical Therapy (DPT) in 2018 from the University of Southern California. While in school, he studied independently in order to become certified as a Strength and Conditioning Specialist (CSCS). He volunteered in his school’s Clinical Exercise Research Center where he performed exercise testing on subjects for research studies. Throughout school, he engaged in clinical affiliations in several local clinics where he specialized in treating patients with orthopedic and cardiopulmonary conditions. In his free time, he enjoys resistance training and following strength-based sports. He is excited to join the community here at OSS and share his passion for movement and health with his patients to help them meet their personal goals.

  • Dr. David Tang, PT, DPT

    Dr. David Tang, PT, DPT

    Staff Physical Therapist

    • Doctor of Physical Therapy (DPT), University of Southern California (USC), 2019
    • Bachelor of Science (BS) in Kinesiology, San Diego State University

    While pursuing his physical therapy degree, David was the Vice President of Physical Therapy Multi-Cultural Leadership Alliance (PTMLA). This is an organization which strives to raise awareness of physical therapy and healthcare to low-income communities within Los Angeles County. Through PTMLA David was able to participate in an international humanitarian trip to Mexico, where he was able to provide physical therapy care to orphans with neurological disabilities. David hopes to continue being able to participate in future humanitarian efforts. David had been engaged in a variety of clinical affiliations where he specialized in treating patients with orthopedic and neurological conditions. He utilizes a client-centered approach in conjunction with an emphasis on movement analysis, manual therapy, and corrective exercise. David makes sure to engage his patients in a discussion on how to help them reach their goals. In his spare time, David enjoys watching TV and movies at home, hiking, snowboarding, and exploring the food scene available in LA.

  • Dr. Rafael Cahill, PT, DPT

    Dr. Rafael Cahill, PT, DPT

    Staff Physical Therapist

    • Doctor of Physical Therapy (DPT), University of Southern California, 2020
    • Bachelor of Arts (BA) in Integrative Biology, Minor in Nutritional Science, University of California, Berkeley, 2012

    Dr. Cahill received his bachelor’s degree from UC Berkeley in 2012 where he studied Integrative Biology and Nutritional Science. He started his career in the Biotech industry where he was a member of the team performing the largest Genome-Wide Association study to date. He has a longstanding passion for health and fitness, specifically resistance training. He sustained an injury during one of his training sessions which ultimately led him on the path to discovering the field of physical therapy. It was at this point he realized it was a perfect marriage of his desire to help heal with his love of exercise. He earned his Doctor of Physical Therapy at the University of Southern California in 2020. During his time, he conducted research regarding the impact of physical therapy following cervical spine surgery. He is very excited to use all the knowledge he has gained to help his patients and anyone else to move well, reduce their pain, and be able to do the activities they love. He still enjoys weight training, and also enjoys cooking/eating tasty food, strength sports, the outdoors, and videogames.

  • Dr. Vincent Ho, PT, DPT, CSCS

    Dr. Vincent Ho, PT, DPT, CSCS

    Staff Physical Therapist

    Doctor of Physical Therapy (DPT), University of Southern California
    Bachelor of Science (BS) in Pharmaceutical Science, University of California, Irvine

    Dr. Ho received his Bachelors in Science degree in Pharmaceutical Science from UC Irvine in 2015. His interests shifted towards preventative medicine and the human body after being involved with research. He was an active participant of 2 research labs. The first lab involved exercise physiology studies which looked into the effects of exercise as a treatment for neonatal asthma. The second lab looked into utilizing neural stem cell transplants as a viable option in potentially reversing the effects of Alzheimer’s Disease. He additionally has a passion for teaching as he became a Basic Life Support (BLS) Instructor and certified students about how to react appropriately during a cardiac emergency.

    Dr. Ho earned his Doctorate of Physical Therapy (DPT) from the University of Southern California in 2019 and is a Certified Strength and Conditioning Specialist (CSCS). He has a special interest in treating orthopedic patients as well as patients with chronic pain. He utilizes many techniques in his treatments which involve McKenzie, Mulligan, instrument assisted soft tissue mobilization (IASTM), myofascial release and cupping. He has a passion for educating patients about therapeutic neuroscience and explaining how pain is conceptualized in the body. Additionally, he is a part of a pro-bono physical therapy organization called ‘The Movement Network’ which provides therapy services for underserved communities. In his free time, he enjoys lifting weights competitively, trying out the latest food trends, enjoying the outdoors, or snowboarding down the steepest mountain.

  • Jennie

    Jennie "Tomi" Eto, MA, OTR/L, CHT

    Hand Therapy Supervisor

    • Certified Hand Therapist
    • Master of Arts in Occupational Therapy, University of Southern California
    • Bachelor of Science in Occupational Therapy, University of Southern California

    Tomi Eto has been practicing hand therapy for nearly a decade. She has comprehensive experience in treating a vast array of diagnoses, both conservatively and post-operatively, and is excellent at fabricating splints. What Tomi truly loves about hand therapy is the one-on-one, hands-on nature of the treatment that gives her the opportunity to see her patients progress and improve while getting to know them individually, building strong relationships as she is teaching and treating them. Tomi is excited to be joining the OSS Elite team, which maintains close contact and open communication with the surgeons to create personalized treatment plans for each patient to get them back to doing what they love to do with their hands. In her free time, Tomi enjoys spontaneous adventures, quadrupeds, Harry Potter, playing and watching sports, reading, cooking, playing board games, trivia nights, traveling and spending time with family and friends.

  • Hallie Spigelman, MS, OTR/L

    Hallie Spigelman, MS, OTR/L

    Staff Occupational Therapist

    • Master of Science Degree, West Coast University
    • Bachelor of Science Degree in Psychology, University of California, San Diego

    Hallie pursued a career in occupational therapy to make a positive impact in the lives of others. After earning her Bachelors Degree in Psychology from the University of California, San Diego, Hallie volunteered in diverse settings and developed a passion for occupational therapy with an emphasis in hand therapy. It was this passion for occupational therapy that led Hallie to obtain her Master of Science Degree from West Coast University. While at West Coast University, she earned the Honorary Academic Achievement Research Award and continued her practice of hand therapy at California Hand Therapy. Hallie is excited to be a part of the OSS Physical and Hand Therapy team where she hopes to continue to ease suffering and improve the quality of all lives. In her leisure time Hallie loves spending time with family, friends, and her English Bulldog, Hank.  Hallie’s lifestyle incorporates health, fitness, and mindfulness. She enjoys boxing, yoga, hiking, music, films, travel and is an avid supporter of animal rescues.

  • Jamie Lulejian, MS, OTR/L, CHT

    Jamie Lulejian, MS, OTR/L, CHT

    Certified Hand Therapist

    • Certified Hand Therapist
    • Master of Science degree in Occupational Therapy, University of St. Augustine for Health Sciences
    • Bachelors of Science Degree in Kinesiology, concentration in Sports Medicine, California Baptist University

    Jamie graduated in April 2016 with a Masters degree in Occupational Therapy from The University of St. Augustine for Health Sciences. Proceeding her schooling, she worked in a private outpatient hand therapy clinic and in an occupational health clinic, gaining experience treating a wide variety of diagnoses. She has advanced practice certifications through the California Board of Occupational Therapy and became a Certified Hand Therapist in 2020. She strives to continue to learn and has taken various continuing education courses and conferences to advance her knowledge in treatment techniques for the shoulder, elbow, wrist and hand. Jamie is excited to be apart of the OSS Physical and Hand Therapy team and she feels that it is important for care coordination between the patient, therapist, and surgeon to create an individualized treatment plan for improved functional use of the arm. Jamie was an intercollegiate springboard and platform diver, which provides a greater background into treating athletes. In her free time, she loves spending time with her husband, daughter, and her Goldendoodle Oakley, and also enjoys arts and crafts, painting, wine tasting, hiking and traveling.

  • Jesse Ayers, COTA

    Jesse Ayers, COTA

    Certified Occupational Therapist Assistant

    • Bachelor of Arts in Criminal Justice, Dakota Wesleyan University, South Dakota
    • Certified Occupational Therapy Assistant (COTA), CBD College, Los Angeles, 2018
    • NASM Certified Personal Trainer
    • Licensed Emergency Medicine Technician (EMT)

    Jesse Ayers graduated as a Certified Occupational Therapy Assistant from CBD College in Los Angeles in 2018. He switched careers from Criminal Justice to Occupational Therapy to be able to help people improve their quality of life. As a musician and athlete, he realized how important hands are to a person’s career and lifestyle, and he decided to pursue a career in hand therapy. He joined the OSS Elite Hand department in 2018. He takes pride in having a wide range of knowledge, which he incorporates into patient care and patient rehabilitation. Jesse has a strong background in athletics, as he played football in college. He also played baseball, and has performed as a drummer. He has maintained his NASM Personal Training Certification since 2011. His hobbies include working on restoring cars and wood items, making old items look new.

  • RoRo


    Certified Pet Therapy Dog

    • Canine Good Citizen test
    • Certified Pet Therapy Dog

    RoRo is the youngest staff member to OSS Elite. He was born December 11, 2016 and has been coming to the clinic since he was 9 weeks old. He is a male, pure breed Maltese weighing in at a whopping 8 pounds. He has hair, not fur and is hypoallergenic. He has passed his Canine Good Citizen Test (CGC) and Pet Therapy Certifications and continues to undergo training each week. He brings joy to those around him and enjoys a good belly rub and giving puppy kisses. You may see him running around the clinic or curled up in his bed taking a nap. He is available for hugs and snuggles to help decrease pain and anxiety to those around him.