Jason White will start work April 1 as executive director of the Warren County Economic Development Corp., replacing Tiffany Coleman, who now is the development coordinator for the Urbandale Development Association. White has been the executive director of the Midwest Partnership EDC, which is the economic development group for Adair, Audubon, Greene and Guthrie counties. Mike Underwood, president of Midwest Partnership EDC, said a search for White’s replacement would begin immediately. White helped revive an organization that was at a “low point” when he arrived, Underwood said in a press release that announced White’s departure.