Mike Tomlin, defensive coordinator for the Minnesota Vikings, has been chosen as the Pittsburgh Steelers' new head coach, SI.com has learned. The official announcement is expected to come sometime in the next two days. Tomlin, 34, impressed the Steelers during the interview process with his organization skills, intelligence and grasp of the game, according to a source familiar with the coaching search. He would succeed Bill Cowher, who resigned Jan. 5 after 15 seasons as the Steelers' coach.