Stephen Hemsley is resuming duties as chief executive at health care giant UnitedHealth Group in a surprise transition as the company’s recent financial woes have intensified. Current CEO Andrew Witty stepped down for personal reasons,

Stephen J. Hemsley returned as CEO after Andrew Witty's surprising decision to leave the insurance giant, which has seen its stock plummet recently.

UnitedHealth CEO Andrew Witty is stepping down for personal reasons and the nation’s largest health insurer suspended its full-year financial outlook due to higher-than-expected medical