Tiffany R. Warren SVP and Chief Diversity Officer, Omnicom Group, and fFounder and President, Adcolor@diverstarTIffany R. Warren is svp and chief diversity officer for Omnicom Group, founder and president of Adcolor, and a member of the Adweek Advisory Board. Perspective: Turning Hope Into Action At different times in the past, identifiers like black quarterback, black golfer, black agency CEO and black president were met with cynicism and incredulity. But a little-known hope dealer from the South Side of Chicago made the latter a reality.