Andrew Witty, who largely led the U.S. healthcare giant from the U.K., made big bets on Medicare enrollees that backfired.

Andrew Witty is a business executive well-known for his contributions to the Pharmaceutical and health sectors.

Also, medical costs for new MA beneficiaries that joined its Optum ... Now, Witty is being replaced by Hemsley, who will remain UnitedHealth’s chairman along with assuming the CEO post.

File - Andrew Witty, Chief Executive Officer of UnitedHealth Group ... including the fast-growing Optum segment.

UnitedHealth CEO Andrew Witty is stepping down for personal reasons ... manager that runs prescription drug coverage and a growing Optum segment that delivers care and provides technical ...

Andrew Witty was the chief executive ... of the company towards consumer healthcare and vaccines. CEO of Optum and UnitedHealth Group Witty became CEO of Optum, a unit of UnitedHealth Group ...

Just about five-and-a-half years after his promotion to CEO of UnitedHealth Group, Andrew Witty ... Before he became CEO, Witty was chief executive of the company’s Optum division.