josh tyrangielJosh Tyrangiel, editor and chief content officer of Bloomberg Businessweek, is leaving the publication. Today is his last day.

“I’ve spent six years working with some of the smartest and most creative people in journalism, and it’s time for me to take my chips off the table, reflect on my criminal good luck, and think about what comes next,” Tyrangiel wrote in a memo to Bloomberg staff.

Businessweek deputy editor Ellen Pollock, previously senior editor at The Wall Street Journal, will succeed him. She becomes the first woman to hold that title in the magazine’s history.

The New York Times yesterday, reporting on Tyrangiel’s departure, referred to him as “a rising star at the news organization.” Tyrangiel began his tenure at Businessweek in 2009, and oversaw that publication’s redesign after its acquisition by Bloomberg L.P. Prior to joining Bloomberg, he was Time’s deputy managing editor.

Tyrangiel’s exit marks the latest in a mass exodus of talent from the news agency. Bloomberg in September laid off about 90 newsroom staffers in New York, Washington and its overseas bureaus. Bloomberg editor-in-chief John Micklethwait penned a 3,000-word memo to staff members, announcing the move as part of a massive “refocusing” of the company’s editorial operations.