Our Team

Our team of physical therapists at PREP Performance Center has close to 6 years of experience in the sports medicine physical therapy profession and over 2.5 years of experience running a successful private practice.

Specializing in treating the adolescent athlete, we not only provide therapy post injury, but seek to implement pre-sport participation movement screens and our 8-week Academy Training programs that have been shown to reduce overuse and non-contact injuries. Some of the statistics below support the need for Physical Therapy Intervention at the youth sport level.


Mary Catherine Casey, PT, DPT

Owner and Founder of PREP Performance Center 

Four Time Division I National Champion Lacrosse Player 
Movement Specialist 
Dry Needling Specialist 
Graston Technique Certified 
Concussion Management Specialist 
Titleist Performance Institute Certified 

Mary Kate graduated with her Doctorate of Physical Therapy from Northwestern Feinberg School of Medicine and currently specializes in sports medicine rehabilitation.   She is a former collegiate lacrosse player with four National Championships as a member of the Northwestern Women’s Lacrosse team, current Head Lacrosse Coach at DePaul Prep in Chicago and a member of the Wellness Team for the Women’s Professional Lacrosse League (WPLL).  In 2019, Northwestern University Physical Therapy Department selected Mary Kate as  the Young Alumni of the Year for her innovative contributions to the Physical Therapy Profession.

Mary Kate sustained an ACL injury early in her freshman year of college, which sparked her interest in physical therapy. During a 6-9 months recovery process, Mary Kate followed a strict program that not only focused on strength, speed, agility, and quickness but also included flexibility, balance, mechanical and proprioceptive training during sport specific activities. This unique training regimen helped her achieve athletic success throughout her collegiate career and into young adulthood. Her holistic approach to injury prevention, sports performance, and mental preparation was born out of this experience.  Her experience both as a former collegiate athlete and an experienced physical therapist, convinces her that something is missing for those athletes who train extended hours to excel in their sport, yet continuously need to fend off injuries.

This along with her extensive understanding of the increasing prevalence of ACL tears, she developed her own ARSI Movement System which she utilizes during her therapy and sports performance programming. Her methodology pre- and post-injury focuses on the assessment of muscle imbalances, recruitment of specific muscles, stabilization of muscle groups and integration of proper mechanical loading during sport specific activities. Mary Kate addresses individual’s weaknesses with a hands on approach, employing manual therapy techniques, Graston Technique, myofascial release, neuromuscular control and dynamic flexibility. Currently, PREP is using DorsaVi wearable technology to provide baseline movement assessments to young athletes to assist with injury risk assessment, limb symmetry and return to play readiness. 

Founder of PREP Performance Center, a physical therapy and sports performance facility, Mary Kate emphasizes the importance of creativity, innovation, education, community involvement, injury prevention and integration with sports performance. Mary Kate’s team is providing cutting edge therapy and sports performance that helps athletes of all ages train like the pros and develop into well rounded athletes despite early sports specialization.




Lois Kettering, PT, DPT, CSCS
Movement Specialist
Certified Strength and Conditioning Specialist (NSCA)
Dry Needling Specialist 

SafeSport Certified

Lois is a graduate of Northwestern University Feinberg School of Medicine with her Doctorate of Physical Therapy. She grew up on the South Side of Chicago with an extensive background in competitive volleyball. After tearing her ACL and meniscus her senior year of high school in the same year as 4 girls in her program, Lois knew she wanted to someday be an integral player in the injury prevention process. She is focused on returning her patients back to peak mental and physical performance, teasing out any underlying pathological factors with an aim to target injury prevention, and individualizing treatment based on each patient’s goals.

Lois has treated in a variety of settings with vast experience in orthopaedics and sports medicine. She has evaluated and progressed Division I NCAA athletes at Northwestern University throughout the fall season through post-surgical management, pre/post practice, in preparation for and following game day, and during non-contact practice drills. Lois was inspired to receive her strength and conditioning specialist certification after spending numerous hours with the strength and conditioning coaches to modify and assess mechanics in order to prevent injuries. She has wide-ranging experience with concussion management and safe return to play with a step-wise graded approach to pin point the various sources of symptom provocation. Lois has trained under advanced orthopaedic specialists while providing video movement analysis, personalized exercise programs to target muscle imbalances, and hands on manual techniques.

When she is not in the clinic, Lois enjoys spending time with family and friends, rooting on the Cubs or Notre Dame Football, playing beach volleyball, and going to the beach or park with her black lab named Clark.



Maya Johnson, PT, DPT
Movement Specialist
Dance Medicine Specialist 

Maya is a graduate of Northwestern University Feinberg School of Medicine with her Doctorate of Physical Therapy. She grew up in the northern suburbs of Chicago dancing and participating in musical theater. Maya has been interested in pursuing a career in physical therapy since an early age influenced by her 15 years of experience dancing and analyzing movement. Her passion for injury prevention came from her restrospective realization of her own overuse injuries. Maya felt she had a lack of education as an adolescent regarding her health and well-being. She is now focused on becoming the advocate and resource she felt she did not have. 

Maya has treated patients in a variety of settings with experience in orthopaedics and sports medicine. She has evaluated and progressed high school athletes at Stillwater High School in Minnesota while in-season and through pre/post season. She has sought learning opportunities with Northwestern University Athletics to understand integration of work done in the physical therapy clinic to training room to field. She has a wide range of experience treating all ages from 8 to 100 years. She is currently seeking her strength and conditioning specialist certification in order to continue developing and learning as a physical therapist to better serve her patients.

When she is not in the clinic, Maya enjoys running along the lakefront trail, baking gluten free recipes, trying new restaurants around the city and spending time with family and friends.



Mary Kate, Lois and Maya utilized their skills as former collegiate and high school athletes to develop the knowledge base and skills necessary to run a unique and growing clinic. Mary Kate has the mindset of an elite athlete and implements similar practices into her business to not only provide quality physical therapy, but unmatched education and customer service. Mary Kate has lead a team of 6 employees through the first 2.5 years of a new business and continues to pursue avenues that will keep physical therapy relevant as health care changes and the need for technology is integrated into healthcare. She is willing to take risks and is always looking for the X-Factor that will keep her and her team ahead of the game.