IBM chief executive Ginni Rometty is stepping down in April, the company announced Thursday. Arvind Krishna, noted as a key architect of the company’s Red Hat acquisition, will become CEO upon Rometty’s exit. Rometty will serve as executive chairman through 2020 and then retire. Red Hat’s CEO Jim Whitehurst was named IBM president. Krishna currently serves as the SVP for IBM’s cloud and cognitive software unit. In a prepared statement, Rometty — who has served as CEO of IBM since 2012 — praised Krishna’s track record with IBM and his ability to lead the company through its next era.