[2][3] Between his undergraduate and master's degrees, DeWitt served as an assistant to William K. Reilly, a former Administrator of the Environmental Protection Agency.

DeWitt helped develop Roger Dean Stadium, the Cardinals' spring training home in Jupiter, Florida, which opened in 1998.

[4][5] After becoming the team's senior vice president of business development, he led the design and construction of the Cardinals' ballpark, Busch Stadium, which opened in 2006.

[3] DeWitt's predecessor, Mark Lamping, left in March 2008 to become the NFL's New York Giants president of New Meadowlands Stadium Company.

[6] DeWitt oversees the business operations of the Cardinals, including sales, marketing, finances, accounting, game-day productions, and other miscellaneous ventures.