Amazon, Berkshire Hathaway and JPMorgan Name C.E.O. for Health Initiative

It’s a marquee name for a marquee venture.

Amazon, Berkshire Hathaway and JPMorgan Chase, the powerful triumvirate that earlier announced its hope to overhaul the health care of its employees and set an example for the nation, said on Wednesday that it had picked one of the country’s most famous doctors to lead the new operation.

Dr. Atul Gawande, a Harvard surgeon and staff writer for The New Yorker magazine, will become chief executive of the new company, which will be based in Boston, on July 9. He said he was not stepping down from his current medical and other duties to take the job.

The choice of Dr. Gawande, a highly respected doctor and writer on health care, was met with surprise because he has little hands-on experience running a large health care organization, unlike some of the boldface names that have been floated as possible candidates.