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.

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 currently in the process of becoming 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.


Free Body Welcomes New Patients