About Us

Your Health Is Our Passion

Marc established Free Body Physical Therapy in 2015 with the intention of breaking the mold of standard physical therapy practices. At Free Body Physical Therapy, your body is treated with individuality and care. No two bodies respond to an injury the same way, and that’s why no two therapy programs should be the same. Free Body Physical Therapy was founded to get you back to your best self. Let’s work together to reach your goals!

Meet your doctors

Dr. Marc Gregory Guillen

Dr. Marc Gregory Guillen


Free Body Physical Therapy is owned and operated by Dr. Marc Gregory Guillen, PT, DPT, OCS, FAAOMPT. After receiving a doctorate in physical therapy and working at several PT clinics along the west coast, Dr. Guillen completed a physical therapy fellowship program in Manual Therapy that less than 1% of physical therapists in the U.S. have completed. This expertise in Manual Therapy provides hands-on knowledge to help patients reach their physical therapy goals. Dr. Guillen offers a close one-on-one relationship with patients where his goal is to educate, empower and maximize recovery in as few visits as possible..Marc Guillen is currently in the process of becoming a Certified Manual Trigger Point Therapist through Myopain Seminars and incorporates Dry Needling in his practice.

Common conditions that Dr. Guillen treats include back pain, neck and shoulder pain, knee and ankle injuries, post-surgery rehabilitation, arthritis, chronic pain conditions, sports injuries, and much more. Free Body Physical Therapy accepts most insurance, Medicare, worker’s comp and self-pay patients. Dr. Guillen is fluent in both English and Spanish.

Marc Gregory Guillen, PT, DPT, OCS, FAAOMPT
Fellow, American Academy of Orthopedic Manual Physical Therapists
Board Certified, Orthopedic Physical Therapy

“Your health is my passion, and I’m excited to begin this journey with you.”

Dr. Marissa Nemec

Dr. Marissa Nemec


Dr. Marissa Nemec, PT, DPT received her bachelor’s degree in Exercise Physiology and Doctorate of Physical Therapy from Marquette University in Milwaukee, WI. She has worked with a wide variety of orthopedic conditions and has participated in continuing education, focusing on her manual therapy expertise. Marissa is a Certified Manual Trigger Point Therapist through Myopain Seminars and incorporates Dry Needling in her practice. She additionally specializes in treating vestibular dysfunction including BPPV, vestibular hypofunction and concussion. At Free Body Physical Therapy, she is looking forward to enhancing her knowledge base and skill set under the mentorship of Dr. Guillen.

As a former dancer and now healthcare professional, Marissa strives to optimize human movement for all individuals. She believes in educating patients, providing personalized care, and having a bit of fun along the way.

Outside of the clinic, Marissa stays active by attending barre classes and roller blading, but also enjoys less productive activities including shopping, relaxing with her cat, and indulging in Chicago’s food scene with friends.

Dr. Michal Czesny

Dr. Michal Czesny


Dr. Michal Czesny, PT, DPT attended Northwestern University in downtown Chicago for his Doctorate in Physical Therapy after receiving his bachelor’s in Exercise Science from Loyola University-Chicago.
Michal has experience treating a range of both acute and chronic musculoskeletal conditions in addition to managing post-operative rehabilitation and care.
As a clinician, Michal prides himself on using a combination of education, exercise, and manual therapy to create a safe, fun environment for patients to meet their various goals and become as independent as possible.
He enjoys taking time to keep up with research so that he can provide the most relevant information to his patients so they can make the best decisions for themselves with their care.Michal is currently in the process of becoming a Certified Manual Trigger Point Therapist through Myopain Seminars and incorporates Dry Needling in his practice. 

Michal played soccer competitively from a young age through college and is eager to funnel that same competitive energy into getting his patients better and faster with the one-to-one model that Free Body Physical Therapy provides.
For Michal, successful treatment is not just by improving pain or function but by showing patients how they keep themselves well, too.

This Wisconsinite has been living in Chicago for the last 10 years and is ecstatic to start serving the community he now calls home.
When he is not thinking about physical therapy, Michal enjoys spending time with his partner and dog, playing board games like Settlers of Catan, some casual computer gaming, and cast iron cooking.
As an Arsenal FC fan who bleeds white and red, don’t be surprised if you find Michal at a pub on match day at 6 in the morning supporting his club!

Free Body Welcomes New Patients