Mark Galli and Andy Crouch are to lead the US magazine Christianity Today.
Galli was previously CT's managing editor and author of Chaos and Grace, and God Wins. He takes on the new role of editor.
"I'm looking forward to helping the staff shape and frame content that will address the most pertinent issues for active Christians," he said.
"And I'm really looking forward to working with Andy Crouch, who will add fresh energy and ideas into the CT mix."
Crouch is author of Culture Making and executive producer of CT's This Is Our City project. He joins CT as its new executive editor.
Speaking about his responsibilities, Crouch said he would be "paying attention to the big picture, and asking big questions about who are we serving, how well are we serving them, and how we earn readers' trust".
It is the first major leadership change at the magazine in 12 years.
Christianity Today President Harold Smith said, "This progressive 'dyad' of Mark and Andy will not only build upon CT's editorial excellence but will also find new ways of delivering our award-winning content in print and through emerging online and digital formats."
Katelyn Beaty, previously associate editor at CT magazine, will now serve as managing editor of CT, overseeing the print publication.
Beaty is the co-founder of CT's magazine site for women, Her.meneutics, and is editorial director of This Is Our City.
She is the first woman to lead the magazine in the role of managing editor.
Previous Christianity Today editor David Neff is refocusing his attention at the global media ministry to the March 2013 launch of the first digital edition of Cristianismo Hoy, a new publication for Hispanic evangelicals.
Ted Olsen will continue serving as managing editor of news and online journalism.