He played college football for the Arizona State Sun Devils and was selected by the Cowboys in the second round of the 1986 NFL draft.
[2] Even as a freshman, his popularity reached a point that metal noisemakers known as "Darryl Clackers", were being sold by stadium vendors.
Clack was selected by the Dallas Cowboys in the second round (33rd overall) of the 1986 NFL draft, to be the backup and possible successor to Tony Dorsett.
[4] Unfortunately for Clack, that was the same year that Herschel Walker arrived to the team from the United States Football League (USFL).
On November 21, he was waived as part of the rebuilding process, to make room for rookie running back Curtis Stewart who was promoted from the developmental squad.
He became the team's starter at running back, tallying 517 rushing yards and 6 touchdowns, while receiving All-World League honors at the end of the season.
After banking he accumulated over 15 years of extensive experience in management and leadership at various companies including Cox Communications.
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.