Brett Hart, '94, Named Acting CEO of United

At United Airlines, the buck now stops with Brett Hart—at least for now.

Chicago-based United said in a statement this evening that its board of directors named Hart acting CEO while Oscar Munoz, the company's previous CEO, takes medical leave after suffering a heart attack last week.

Hart, 46, previously served as general counsel and executive vice president at United. He's well-known in Chicago's business world, having worked as general counsel and corporate secretary at Sara Lee.