Mercer Island, WA Physical Therapy
Phone
(206) 232-9045Fax
(206) 232-8871
Clinic Hours
- Monday
- 8:00 AM - 6:00 PM
- Tuesday
- 8:00 AM - 6:00 PM
- Wednesday
- 8:00 AM - 5:00 PM
- Thursday
- 8:00 AM - 6:00 PM
- Friday
- 8:00 AM - 5:00 PM
- Saturday
- Closed
- Sunday
- Closed
Services & Treatments at this location
- Augmented Soft Tissue Mobilization
- Back Pain
- Chronic Pain
- Concussions
- Custom Hand Splinting/Orthoses
- Elbow and Wrist Pain
- Ergonomics Instruction
- Foot and Ankle Pain
- Gait Analysis
- Headaches
- Knee Pain
- Manual Therapy
- Medical Nutrition Therapy and Nutrition Counseling
- Motor Vehicle Accident Injuries
- Orthopedics
- Pelvic Health
- Prehab
- Post-Op Care
- Shoulder Pain
- Sports Physical Therapy
- TMJ
- Vestibular Imbalance
- Weight Loss Metabolic Management
- Workplace Injury
Meet the Team

Douglas Free PT, DPT, OCS
Regional Director, Clinic Director, Board-Certified Orthopaedic Clinical Specialist
Douglas Free PT, DPT, OCS
Regional Director, Clinic Director, Board-Certified Orthopaedic Clinical SpecialistDouglas Free was born and raised in the Pacific Northwest and has spent most of his life here. He has been the director of Mercer Island Physical Therapy since 2001. He has worked diligently to provide the highest quality and most effective care possible, and in doing so has developed a strong reputation in the community and with referring doctors. He specializes in treating neck and back pain utilizing a variety of treatment approaches to best fit the needs of the individual patient. This includes, but is not limited to, the teachings of Robin McKenzie, also known as Mechanical Diagnosis and Therapy. He enjoys family activities with his wife and two children including snow skiing, swimming, and walking the dog.
Education:
- Bachelor’s of Arts degree in Psychology with a minor in Zoology from Central Washington University, 1993
- Doctor of Physical Therapy degree from the University of Southern California, 1999
Organizations:
- American Physical Therapy Association

Kim Cervenak PTA
Physical Therapist Assistant
Kim Cervenak PTA
Physical Therapist AssistantKim received her Bachelor’s of Science degree in Kinesiology from Washington State University. Following school she moved to Southern California and worked as an escrow officer for several years. Her passion for patient care lead her to return to the northwest and pursue her Physical Therapist Assistant degree from Green River Community College. While in school, Kim worked as a caregiver for a woman with brain cancer and another woman with MS. She has clinical experience in skilled nursing, assisted living, and inpatient physical therapy settings. She participated in the Susan G. Komen 3-Day for the cure Breast Cancer walk. In her free time, Kim enjoys working out, snowboarding, wake-boarding, traveling, and hanging out with friends and family.
Education:
- Bachelor’s of Science degree in Kinesiology from Washington State University
- Physical Therapist Assistant degree from Green River Community College

Tanner Dalgardno PT, DPT
Doctor of Physical Therapy
Tanner Dalgardno PT, DPT
Doctor of Physical TherapyMy name is Tanner and I love treating a wide variety of injuries and pathologies with a particular interest in post-op recovery including ACL, meniscus repair, and rotator cuff. I believe every individual is unique, and any plan of care should reflect just that. I was born and raised in the Seattle area but have spent time living in Colorado and Arizona, and I have loved exploring what all these places have had to offer. Most weeks you can find me with my wife at the pickleball courts playing with friends, going to the movie theater and seeing what latest flick is playing, or experimenting and trying different craft coffee roasteries.

Isha Sheth PT, DPT
Doctor of Physical Therapy
Isha Sheth PT, DPT
Doctor of Physical TherapyAt RET Mercer Island, we are thrilled to have Isha Sheth as a valued member of our team. Isha is a dedicated physical therapist with licenses in the USA and India. Graduating from Loma Linda University, California with a Doctorate of Physical Therapy, Isha specializes in orthopedic conditions. She has extensive experience in treating shoulder, elbow, knee, and hip pain as well as a variety of sports injuries. Her expertise spans across a diverse patient demographic, from adolescents to older adults.
What sets Isha apart is her commitment to whole-person care. Rather than solely focusing on the diagnosis, she takes a holistic approach to treatment, addressing each patient’s unique needs and overall well-being. This comprehensive perspective ensures personalized and effective rehabilitation strategies that promote long-term health and functional improvement.
Outside the clinic, Isha enjoys a range of activities that reflect her dedication to self-care and adventure, including yoga, reading, hiking, and scuba diving. These interests not only enhance her professional practice but also contribute to a balanced and mindful approach to health.
At RET, Isha is dedicated to providing exceptional care and supporting each patient’s journey toward a healthier, more active life.

Margret Lyons RDN, CD
Nutritional Services Program Director
Margret Lyons RDN, CD
Nutritional Services Program DirectorMargret Lyons earned her Bachelor of Science with a focus in Nutrition/Dietetics from Bastyr University.
Margret specializes in dietetics and is most interested in helping people achieve a healthy lifestyle and allowing them to focus on being better, not perfect!
In her free time, Margret enjoys running, hiking/climbing, and gardening.

Shikha Shah PT, DPT
Doctor of Physical Therapy
Shikha Shah PT, DPT
Doctor of Physical TherapyShikha is a dedicated physical therapist with a strong background in movement and recovery. Holding a Bachelor of Physical Therapy from RGUHS, India, and a Doctor of Physical Therapy from the University of Montana, she is currently deepening their expertise in an Orthopedic residency. Outside of work, she enjoys skiing, playing pickleball, and exploring new recipes in the kitchen. With a balanced approach to life and therapy, she is committed to helping others achieve their best physical health.
RET Physical Therapy in King County
A reliable option for those looking for exceptional physical therapy in King County, near Luther Burbank Park, is RET Physical Therapy & Healthcare Specialists. Conveniently located on Mercer Island, our physical therapy clinic is just off Interstate 90, near Newcastle Beach Park. For outstanding physical therapists near Roanoke, look no further than RET. Here, you’ll find that our physical therapists are committed to providing high-quality and effective care at any stage of your rehabilitation journey.
Specialties & Treatments at Our Clinic
RET Physical Therapy & Healthcare Specialists on Mercer Island take great pride in offering comprehensive and advanced physical therapy services to all our patients. The combination of certified physical therapists utilizing cutting-edge therapies and equipment is a valuable resource for people seeking treatment for various conditions. If you’re experiencing chronic pain, have had a traumatic injury, or are seeking an overall improvement in your physical health, you’ve come to the right place. We provide individualized treatment plans tailored to each patient’s needs and goals. A few of our many specialties include Blood Flow Restriction Therapy, Prenatal & Postpartum Therapy, and Medical Nutrition Therapy. We also utilize the latest physical therapy equipment, such as an Alter-G Anti-Gravity Treadmill, that assists with several conditions. RET is committed to helping you recover quickly and efficiently with long-lasting, pain-free results.
Meet Our Top Therapists in Mercer Island
When you’re seeking physical therapy on Mercer Island, choosing RET Physical Therapy & Healthcare Specialists is easy. Our certified and experienced team of physical therapists is dedicated to maintaining high patient care standards through ongoing education in cutting-edge techniques. Our empathetic approach ensures we understand your unique needs, and we believe in the power of teamwork to facilitate your progress. We also offer support with appointment scheduling, insurance claims, and payment plans for a stress-free experience. Book your first appointment with RET on Mercer Island and start your healing journey with a trusted team.
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