Fitness and Rehab Advisory Board

Founder & CEO, Gray Institute® | Founder of Applied Functional Science®

Widely recognized as the “Father of Function” and a leading authority in human movement, Dr. Gary Gray is the Founder and CEO of Gray Institute® and the creator of Applied Functional Science® (AFS), a revolutionary approach to understanding and enhancing human movement. With nearly five decades of experience spanning physical therapy, rehabilitation, sports performance, and functional training, Gary has dedicated his career to transforming how movement professionals assess, treat, train, and empower the human body.

A recipient of the prestigious John H.P. Maley Award from the American Physical Therapy Association (APTA) for his contributions to physical therapy, Gary’s groundbreaking work has influenced practitioners and organizations worldwide, including professional and collegiate sports teams, elite athletes, healthcare organizations, and the U.S. military.

As an internationally respected educator, innovator, and mentor, Gary continues to advance the science and application of human movement through Gray Institute’s educational programs, certifications, and strategic collaborations, including WingX—bringing his unique perspective to innovative solutions for prevention, rehabilitation, performance, and lifelong wellness.

President, Gray Institute® | Director of GIFT & Faculty

Doug Gray is the President of Gray Institute®, Director of GIFT (Gray Institute for Functional Transformation), and a Fellow of Applied Functional Science® (FAFS). A seasoned business leader, entrepreneur, educator, and movement professional, Doug brings more than two decades of experience advancing the understanding and practical application of human movement across fitness, rehabilitation, sports performance, and wellness.

Working alongside Dr. Gary Gray, Doug has played an instrumental role in developing and delivering Gray Institute’s educational systems, certifications, and professional mentorship programs, including co-developing 3DMAPS® (3D Movement Analysis & Performance System) and pioneering Applied Functional Science Nomenclature. A former collegiate All-American athlete, national presenter, and performance coach, Doug has worked extensively with movement professionals, elite athletes, professional sports organizations, and military personnel.

His passion lies in connecting the science of movement with real-world solutions, including Gray Institute’s collaboration with WingX, helping professionals and organizations enhance human performance, improve outcomes, and positively impact lives.

Dr. Mark Erickson earned a Bachelor’s degree in Physical Therapy, Master’s degree in Higher Education, and an advanced Doctor of Science degree in Physical Therapy. His advanced certifications include:

• Orthopedic Physical Therapy by the American Board of Physical Therapy Specialists
• Orthopedic Manual Physical Therapy by the North American Institute of Manual Therapy
• The Feldenkrais Method of Body Awareness Training by the Feldenkrais Guild
• Strength and Conditioning Specialist by the National Strength and Conditioning Association
• Dr. Erickson has been practicing physical therapy for 42 years and teaching entry-level, residency and post-professional Physical Therapy for 33 years.

He has received numerous awards, including the WPTA (Wisconsin Physical Therapy Association) Mentor of the Year and the Arthritis Foundation Health Professional Award for Outstanding Service.

Dr. Erickson has maintained an active scholarship agenda investigating innovative education pedagogy, unique exercise technologies, body awareness training, performing arts, persistent pain, and orthopedic physical therapy. He has presented research as well as clinical courses at numerous state, regional, national, and international conferences.

Dr. Erickson has always maintained an active physical therapy private practice, Insight Physical Therapy, and owns and operates Insight Exercise and Body Awareness Training, LLC. He also serves on the WINGX Advisory Board. Dr. Erickson is an extraordinary teacher and clinician.

Mark graduated cum laude from Florida Gulf Coast University with a Bachelor’s degree in Finance, concentrating in Analysis and Management. A four-year member of the university’s golf team, he developed a strong foundation in athletic performance, discipline, and the importance of physical wellness.

After college, his passion shifted toward fitness, leading him to earn his Certified Personal Trainer (CPT) license through the National Federation of Professional Trainers (NFPT). With a strong background in golf, he sought to blend the two disciplines and went on to earn his TPI Level 1 Certification, specializing in golf-specific movement and performance.

Despite years of intense training in the gym, he eventually hit a plateau—dealing with constant soreness, fatigue, lack of flexibility, and diminishing returns. It became clear he was overtraining. That turning point led him to discover WINGX.

By moving away from traditional weight training and putting his focus on the WINGX system, he experienced dramatic improvements: increased energy, better flexibility, sharper focus, reduced soreness, and a remarkable 40-yard gain in his driver carry—all from the breakthrough air resistance of WINGX.

WINGX completely transformed his approach to fitness and quality of life. Now, he’s on a mission to share that transformation with others. Through his expertise and personal journey, he helps clients unlock their potential and experience the powerful benefits of WINGX Fitness—both on and off the golf course.

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