Fort Lowell


We believe we can do more together than we can alone. Our goal is to improve the lives of those we touch by applying current and effective treatment paradigms in a healthy, healing atmosphere, encouraging progress. We look forward to serving you!

Our Team

Lukas TvedtClinic Director - PT, DPT, OCS

Dr. Tvedt received his Bachelor of Science degree in Kinesiology with a minor in Psychology from California Polytechnic State University, in San Luis Obispo, CA, and his Doctor of Physical Therapy degree from the #1 rated Physical Therapy program in the US ,at The University of Southern California in Los Angeles, CA. As a licensed physical therapist Dr. Tvedt graduated from an American Physical Therapy Association accredited Orthopaedic Clinical Residency, and has earned a board certification in the specialty of orthopaedics (OCS) through the American Board of Physical Therapy Specialties. He continues to be an active member of The American Physical Therapy Association, and APTA’s Orthopaedic Section. While attending Cal Poly, SLO, Lukas conducted independent published research on the topic of Diabetic Peripheral Neuropathy titled “Clinical Effectiveness of Monochromatic Infrared Energy and Therapeutic Exercises on Balance, Gait, & Protective Sensation in Patients with Diabetic Peripheral Neuropathy”, and he assisted research in the Motor Behavior/Learning Lab at USC.

Dr. Tvedt continues to instruct other clinicians locally and nationally on the topics of manual therapy for the spine & sacroiliac joint, as well as the hip/lower extremity. Lukas developed an anatomy & physiology based curriculum utilized internationally by a renowned Pilates organization for certification of its instructors. He currently serves as a clinical mentor within an APTA accredited orthopaedic residency for licensed physical therapists seeking advanced clinical practice with Team Movement for Life, & The University of Southern California.  Dr. Tvedt has over 10 years clinical experience in the outpatient realm, and is the clinic director of Athlon Physical Therapy at Ft. Lowell treating athletes ranging from weekend warriors to Major League Baseball, Mixed Martial Arts, ballet dancers, golfers, football, tennis and volleyball players. He holds an adjunct faculty position with Northern Arizona University’s Department of Physical Therapy & Athletic Training. He also sits on the Clinical Advisory Board for NAU’s entry level Doctor of Physical Therapy (DPT) program, which is in place to further support their mission and continue efforts to enhance clinical education for tomorrow’s leading clinicians. 

Outside the clinic, Lukas serves to raise money for local charities as a member of the Fiesta Bowl Committee, and as a charter member of the Nova Home Loans Arizona Bowl Committee. Dr. Tvedt was honored in 2016 with the Tucson Hispanic Chamber’s Top 40 Under 40 distinction for professionals serving the greater Tucson region. Lukas & his wife Mandy, who is the clinical director at Athlon on Tucson’s East side, along with their three sons Miles, Nolan, and Wyatt enjoy traveling, and spending time with family & friends. 

Doctor of Physical Therapy
University of Southern California

Bachelor of Science, Kinesiology with a minor in Psychology
California Polytechnic State University 

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Shari SheppardFront Office Manager

Shari was born and raised in Colorado and moved to Tucson, AZ in 1984. She has been employed at Ft. Lowell Physical Therapy since May 2007. Shari enjoys and excels in her front office position. Her cheerful personality makes the patients feel welcome.

Her greatest fulfillment is to see the smiling faces of the patients when they graduate. Outside of the office she enjoys reading, baking and gardening and is an avid Dallas Cowboy fan.

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Jonny Sue Perkins-SnyderPT, OCS

Jonny Sue Perkins-Snyder, PT graduated from the University of North Carolina at Chapel Hill with a BS in PT in 1982. She joined Fort Lowell Physical Therapy in 2002. Her professional interests include treatment of neck, back and extremity injuries utilizing a manual therapy approach and fall prevention in the aged population.

She enjoys treating a variety of patients, helping them achieve their personal goals for rehab, whether it’s return to work, return to sports or simply getting back to their optimal level of function. In June, 2013 she earned recognition as a Board Certified Orthopedic Clinical Specialist through the American Board of PT Specialists, an achievement that only ~7% of therapists nationwide have earned.

Jonny Sue has a wealth of expertise and knowledge developed over 30 years of practice. She has previously worked in industrial injury prevention and management, including ergonomic worksite evaluations, functional capacity evaluations, and injury prevention training for workers.

In her free time, Jonny Sue stays busy with volunteer activities at her daughter’s school and her church. She enjoys hiking and snow skiing, and she cheers on the UNC Tarheels whenever she can.

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Daniel MusselwhitePT, DPT, ATC

Daniel grew up in Murfreesboro, Tennessee.  In 2014, Daniel completed the athletic training program at the University of Evansville and became a certified athletic trainer. He continued his education at Washington University in Saint Louis- School of Medicine where he received his Doctor of Physical Therapy in May of 2017.  Outside of the clinic, Daniel enjoys swimming, biking, hiking, and spending time with family and friends. 

Washington University in St. Louis – School of Medicine, Saint Louis, Missouri
Doctor of Physical Therapy, May 2017

University of Evansville, Evansville, Indiana
Bachelor of Science, Athletic Training, May 2014

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Anna BarrettPT, DPT

Anna was born and raised in Chico, California where she enjoyed playing volleyball and competing in artistic roller-skating.  She earned her Bachelor of Science from the University of California Davis and worked as an Emergency Medical Technician.  Anna went on to earn her Doctorate of Physical Therapy from University of the Pacific in 2016 and began practicing in the outpatient orthopedic setting.  She moved to Tucson to be with her husband who is a pilot in the Air Force.  Outside of the clinic, Anna enjoys hiking, yoga, and going on adventures with her dog River. 

University of The Pacific, Stockton, California
Doctor of Physical Therapy, September 2016

University of California Davis, Davis, California
Bachelor of Science, Exercise Biology June 2012

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Alissa RothpletzPTA

Alissa was born and raised in Scottsdale, AZ, then moved to Tucson in 2004 to attend the University of Arizona (both her parents are Wildcats). She was drawn to a
career in Physical Therapy due in part to my involvement with the Disability Resource Center and Adaptive Athletics Department for students and community
members at the U of A. Alissa has also enjoyed volunteer experiences with wheelchair rugby, wheelchair basketball, and working with whole life therapy summer camps
in Rhode Island and New York for individuals with spinal cord injuries. Following graduation, she began working at (then) Fort Lowell Physical Therapy as a technician, and maintained an ongoing connection to the company. Subsequently, she returned to school and obtained her certification and license as a Physical Therapist Assistant in 2016.

She is looking forward to using her broad experience and education to work with patients to help them achieve their therapy goals, and hopes to make them smile while doing it! In her leisure time, she enjoys playing recreational soccer with her husband Mark, bicycling, traveling and exploring new places with good food, and spending time with her two dogs.

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Samantha BettenhausenPTA

Samantha was born in Seattle and raised in Tucson. She became interested in physical therapy after a shoulder injury that required surgery. Samantha saw both the pre and post-operative treatment and how it helped her recovery.

In 2015, Samantha became a technician at Athlon-Tanque Verde where she developed a passion for the job and for helping patients with their own recovery. Through her role on staff, she was able to be involved with patients treatments from beginning to end, and add "Atmosphere Coordination Expert" to her title, where she helped the clinic get involved with local charities and volunteer opportunities. Samantha realized that Physical therapy was the career she wanted to pursue, and enrolled in Pima Medical Institute.

While at Pima Medical Institute, her clinical internships involved local outpatient clinics, and a rural North Dakota clinic involving skilled nursing facilities, a hospital, outpatient clinics, and a Summer Sports program for elementary kids. Samantha loves to work with orthopedics and athletes. Outside of the clinic, you can often find her running, cycling, or at the gym. She also loves the Tucson food scene and exploring local coffee shops.

Pima Medical Institute: Associate of Occupational Science 2017

Pima Community College: Associate of Science 2015 

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Irene UrendaLead PT Technician

Irene is a certified physical therapy technician graduate of Pima Medical Institute and has been employed at Ft. Lowell Physical Therapy since 1992. She is highly experienced in all aspects of clinic work and enjoys working closely with patients.

Irene has been married to her husband Bobby for 32 years and they have 3 grown children and 4 grandchildren. During her time away from work she enjoys reading, puzzles, watching her grandkid’s sporting events, and baseball. She is an avid LA Dodger fan.

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