Sticky nav override script is here

About Us

At Xtreme Performance Lab our team has more than 30 years of experience training elite athletes, both mentally and physically, to reach their peak performance. XPL’s cutting-edge technologies enable us to identify, measure, train and reach The Zone, the ultimate state of optimal performance. Our remote service delivery platform allows us to train anyone, anytime, anywhere. We offer the next generation of elite training that can turn athletic instinct into unbeatable performance.

The XPL Team

David Clark

David Clarke

President and Chief Executive Officer

David A. Clarke graduated from Dickinson College in Carlisle, Pennsylvania, majoring in computer science and physics. He was hired out of school as a programmer with IBM.   In his 15 year tenure, he became a Senior Programmer specializing in the emerging field of speech recognition technology. In 2001 Mr. Clarke started his own company, Voice Innovations, and the CallMaX Brand of speech-enabled services. He grew CallMaX to service 5,000 clients and sold the company in 2016 with designs on retiring and traveling the world with his wife. He quickly discovered that retirement did not challenge him enough. Recognizing the potential for neurofeedback in athletics, he gathered a team and created Xtreme Performance Lab.

Dr. Michael Mark

Michael Mark, Psy.D., J.D., BCN

Board Certified in Neurofeedback, Associate Fellow

VP of Product Development

Dr. Mark received his BA from UCLA in International Relations and his Juris Doctorate from Southwestern University. He is board certified in Neurofeedback and an Associate Fellow of the Biofeedback Certification International Alliance. He has specialized since 1995 in both peripheral and EEG biofeedback training, with an emphasis on sports concussion and traumatic brain injury acute clinical assessment, rehabilitation and return-to-play programming and elite level performance optimization. Prior to his work in neurophysiology, Dr. Mark was the President of a prestigious full-service entertainment management company, serving as Chief Operating Officer managing 60+ employees, and personally advised and counseled 100+ clients. Early in his career, he served as a professional sports lawyer and player representative, representing numerous players in the NHL and NBA. 

Dr. Audrey Hill-Lindsay

Audrey Hill-Lindsay, Ph.D.
Psychologist License:   PSY22270 (CA),   020483(NY)

Director of Product Development

Audrey Hill-Lindsay is a clinical psychologist specializing in health psychology, biofeedback and neurofeedback. Prior to collaborating with Dr. Michael Mark, she began integrating biofeedback and neurofeedback into treatment plans for sports-related rehabilitation and performance. Dr. Hill-Lindsay was a competitive gymnast growing up, allowing her to be familiar with the pressures of sports performance, injury prevention and traumatic brain injuries. She completed undergraduate studies at The University of California, Santa Barbara with a degree in Biopsychology, and holds a Masters Degree and Ph.D. from The California School of Professional Psychology at Alliant International University.

Bob Marra

Bob Marra

VP of Business Development


During his diverse career, Bob has owned and operated marketing and sales agencies, media companies and held leadership positions in multi-national communications companies and sports leagues. Before joining Xtreme Performance Lab he was the executive director and CEO of the Humana Challenge and CareerBuilder Challenge PGA TOUR golf tournaments which were formerly known as the Bob Hope Desert Classic. Prior to his work at the tournament, Bob operated a market research and economic intelligence company, a marketing and public relations firm and a weekly business and public affairs newspaper. As part of his publishing activities, Bob has published The Big Three and Me, and the award-winning biography of legendary Hall of Fame golfer Billy Casper.

Brian Dodge

Brian Dodge

Director of Engineering


Coming from an eclectic background, mixing interests in physics, psychology, art, Brian has made a career of integrating his technological and creative acumen. He started with interests in bio-hacking at Georgetown University, where he received a Bachelor of Arts and Sciences. He has continued to pursue his passion through his work with virtual reality and neuro-physiological feedback systems and is excited to join the XPL team to push the limits of optimization of the mind-body connection.

Christina Edwards

Christina Edwards

Chief Operating Officer


Coming to Xtreme Performance Lab from the Multi-Family Software Industry, Christina believes that great client support is an integral part of any company. With over 12 years of experience working with the top names in Multi-Family, she is excited to bring her knowledge and skills to the world of professional athletics. Christina holds a Masters of Business Administration from Kennesaw State University.