Darryl Earl Clack is a former American football running back in the National Football League for the Dallas Cowboys. He also was a member of the Toronto Argonauts in the Canadian Football League. He played college football at Arizona State University. After his playing days, Clack went to the University of Texas at El Paso earning a B.A. in Kinesiology and Sports Studies. He moved around the business world for a time and settled into the banking business as vice president at Compass Bank in Tempe, Arizona, not far from the Arizona State University campus. After banking he accumulated over 15 years of extensive experience in management and leadership at various companies including Cox Communications.

He then earned an M.A. in Organizational Management from the University of Phoenix and was in his first year of working towards a Ph.D. when he fell ill to Thrombotic thrombocytopenic purpura (TTP), a rare autoimmune blood disorder.

In addition to TTP, in July 2016, he learned of his early-stage dementia diagnose, due to years of trauma to the head from playing football.

These traumatic events, three months apart, prompted Darryl to write the book "Hear My Story Before I Forget" and start a foundation to bring awareness to TTP and brain injuries.

Although he is no longer playing ball, he keeps his hand in the game as President and co-founder of SportMetric, along with co-founders Josh Jakubczak and Darius Perry, a company emphasizing education, community involvement, and athletics for the youth.

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