Washington Wellness

About Us

Our physical therapists are licensed professionals with extensive knowledge and training in anatomy, physiology and biomechanics of the body. They will provide comprehensive, individual and goal-oriented treatment with emphasis on biomechanical evaluations, manual techniques and active patient participation.

With years of experience in the field our expertise can help take you from injury to prevention to enhancement of movement. We strive to reach the highest potential that allows for an independent, active and robust lifestyle.


Kelly Leininger, PT, DPT, CSCS

Kelly graduated from the University of Pittsburgh with a B.S. in Rehabilitation Science and in 2005 earned her Doctor of Physical Therapy degree. She is also a Certified Strength and Conditioning Specialist by the National Strength and Conditioning Association and became certified in Trigger Point Dry Needling in 2011. Kelly is an active member of the American Physical Therapy Association.

Kelly’s interest in the field started at a young age through her own experience as a physical therapy patient. The blend of health, sports and activity combined with a desire to help others formed an ambitious therapist in an evolving field.

Kelly has experience treating an extensive variety of conditions in patients ranging from adolescents to geriatrics including, high school, college, recreational and professional athletes. Throughout a patient's treatment session Kelly emphasizes an evidence-based approach combining manual therapy techniques with functional retraining to return patients to their optimal level of function.

Kelly views medicine as a team approach between the patient, physician, therapist and other healthcare providers to expedite a patient’s recovery.


Michelle Mathis, PT, DPT, ATC
Michelle grew up in Jacksonville, FL. She graduated from the University of North Florida with her Bachelor’s degree in Athletic Training and is a certified Athletic Trainer. After earning her Doctor of Physical Therapy degree from the University of St. Augustine for Health Sciences Michelle moved to Alexandria, VA. 

Michelle has worked with high school and collegiate athletes in various sports for prevention and rehabilitation of injuries. Also, she has experience with patients from adolescents to geriatrics with all levels of activity and various conditions. She seeks to understand the patient’s goals towards therapy with having ample communication with the patient. Her priority is to return the patient to activities that provide enjoyment and prevent future relapses. Michelle first became interested in physical therapy in high school while sustaining an injury playing soccer. She continues to be active by participating in endurance events, including finishing her first marathon in 2012. She also enjoys hiking, practicing yoga, and spending time with family.


Mary Jean Stack, PT, DPT, CSCS
Mary Jean Stack earned her Doctorate of Physical Therapy from New York University where she received the Elizabeth C. Addoms Award for Academic and Clinical Excellence. As an undergraduate at Muhlenberg College, Mary Jean majored in Dance and Russian Studies. She is a Certified Strength and Conditioning Specialist by the National Strength and Conditioning Association and is an active member of the American Physical Therapy Association and the International Association for Dance Medicine & Science.

Mary Jean first became interested in the field of physical therapy following her own injuries as a ballet dancer. In high school, she attended the prestigious Kirov Academy of Ballet in Washington, DC where she received an Artistic Degree. As a physical therapist, Mary Jean utilizes her prior dance background to assess biomechanics and movement in both dancers and non-dancers. As a clinician, she understands first-hand the importance of individualized and patient-centered care to enable patients to achieve their personal goals. She strives to help all her patients become pain free and stronger than before their injuries. In her free time, Mary Jean enjoys dancing and spending time with her family and friends and her dog, Abby.


Sasha Nuñez PT, DPT, CMPT, PMA®-CPT
Sasha is originally from Miami Florida. She trained rigorously in ballet and modern dance at New World School of the Arts and went on to earn the Dean's award of distinction in dance. During this time, she sustained a back related dance injury and was treated with both a physical therapy and Pilates based rehab program which influenced her love for movement sciences, fitness and wellness. 

She received her bachelor's in Exercise Science from Florida State University and later received her Doctorate of Physical Therapy from the University of Miami. While in graduate school, she continued to teach dance and teach Pilates. She became a certified Pilates instructor for rehabilitation through Polestar Pilates Physical Therapy and  a nationally certified through the Pilates Method Alliance. In 2015, she furthered her education by becoming a certified manual physical therapist through Florida Institute of Orthopedic Manual Physical Therapy.

Additionally, Sasha has had the opportunity to work for Dr. Jace Provo senior vice president of medical affairs for the NBA and has also worked in outpatient, inpatient rehab and acute care physical therapy. She uses all of her experiences to provide comprehensive treatments to a variety of patient populations.




Sarah Weimer, PT, DPT
Clinical Director

Sarah Weimer grew up in Meyersdale, PA.  She graduated in 2006 with a Bachelor's degree in Exercise and Rehabilitative Science from Slippery Rock University. After earning her Doctor of Physical Therapy degree from Shenandoah University in 2009, she moved to Washington DC.  In 2011 Sarah became certified in Trigger Point Dry Needling and has been an active member of the American Physical Therapy Association.

Sarah’s interest in Physical Therapy developed through her own experiences and injuries sustained as an athlete. Her interest in full body health and return to full function grew when she worked with Wounded Warriors returning from the War in Afghanistan through her clinical rotation at the Naval Medical Center in San Diego, CA. Outside of physical therapy; Sarah plays in multiple sports leagues for Basketball and Volleyball. She is also an avid runner completing half and full marathons.  Her passion for sport rehabilitation allows her to connect with patients that strive to enhance their performance and ensure pain free activity. 
Sarah's philosophy:
“Personally, I teach each patient how to not only manage their current condition while they are in Physical Therapy, but also teach them the foundations of returning to/starting up a balanced workout regimen. Physical Therapy is not only about treating the condition that is causing them pain/discomfort, but helping people to realize that they can run a marathon, go to the gym, or even walk a mile.”


Blair Callaghan, PT, DPT
Blair grew up in Tacoma, Washington before pursuing a degree in Biology and a four-year college lacrosse career at the University of Redlands. After graduating in 2012, she spent a year working as a physical therapy aide before heading to Columbia University where she earned her Doctor of Physical Therapy.

Blair enjoys working with a range of patients and aims to instill in each of them the knowledge and confidence needed to regain function and improve their overall fitness. She has experience working with inpatient neurological disorders as well as weekend warriors and professional athletes in an outpatient setting. Outside of physical therapy, Blair loves hiking, running, playing lacrosse and spending time with her kittens, Toby and Leo.


Kayla Heering, PT, DPT
Kayla grew up in Atlanta and moved to the Washington, DC area to attend undergraduate school at the University of Maryland. After graduating cum laude in Kinesiology, Kayla decided to continue pursuing her interests in health sciences by studying Physical Therapy at the George Washington University, where she was inducted into the national Alpha Eta Honor Society for academic success and leadership. In PT school, Kayla developed an interest in treating orthopedic and neurological patients ranging from the adolescent to the geriatric population and is excited to use her skills to treat patients at WWPT. 

Kayla believes that physical therapy should be one of the primary methods used to relieve pain, restore function, and improve quality of life. Kayla enjoys finding the root of her patients' pain and working with her patients to develop an effective plan of care. In addition to helping her patients, Kayla enjoys traveling, hiking, and drinking coffee.


WWPT is always looking for motivated physical therapists dedicated to the field and patient care to join our team.  If you are interested in working with a skilled staff focused on evidenced based treatments please send your resume to: info@washingtonwellnesspt.com.