Emory Healthcare’s longtime president and chief executive, John T. Fox, is leaving to head Detroit’s Beaumont Health System, the Atlanta hospital group said Wednesday.

Fox said he will step into the CEO role at the Michigan hospital network on March 25.

Emory Healthcare said Wright Caughman, CEO of Woodruff Health Sciences Center, and Michael Mandl, chairman of Emory Healthcare’s board, will serve as interim leaders until a new president and chief executive is named.

“While leaving Emory Healthcare is a difficult decision, the challenge of leading Beaumont Health System, as well as the opportunity to be closer to family, played a significant role in this decision,” Fox said in a press release.

He will be heading a non-profit hospital group that was created last September by combining Beaumont Health with Oakwood Healthcare and Botsford Health Care. The combined system has eight hospitals in metro Detroit and southeast Michigan, with 33,000 employees and roughly $4 billion in revenues.

Fox has worked at Emory Healthcare, a group of teaching hospitals with roughly 16,000 employees, since 1999.

“John has built an exceptionally strong leadership team, and they will remain in place and continue to function in their current roles,” said Caughman. “We are appreciative of all that John has accomplished in his 15 years at Emory, and thanks in large part to John’s leadership, Emory Healthcare is well positioned to engage, flourish and lead through the changes that will be part of the landscape of academic health care in the 21st century.”