Megan Sullivan has left her position as head buyer for Harvard Book Store. She will be joining America’s Test Kitchen as an assistant editor in August.

Joe Macavage has been promoted to the newly created position of director of fulfillment operations for all of HarperCollins U.S.

Stephanie Frerich has joined Nomadic Learning, an e-learning startup and online publishing platform, as editorial director. Previously she was senior editor at McGraw-Hill Business.