Jennifer Keltner will join Martingale as publisher and chief visionary officer, effective April 16. Keltner most recently served as crafts group content chief at Meredith Corp. Tom Wierzbicki, Martingale’s president and CEO, is leaving the company to pursue a new career opportunity.

At Bloomsbury, Kathy Belden has been promoted to senior executive editor.

Mally Anderson has been promoted to associate editor for The Penguin Press.