Hachette Book Group has hired MK Creative Media Marketing, a New York-based advertising firm and media agency. MK will handle HBG's media planning and buying, resulting in the dissolution at year's end of the house's internal ad buying team.

In response to why the publisher enlisted an outside agency, Sophie Cottrell, v-p, communications director at HBG said: "[MK's] portfolio spans multiple industries — including publishers, movie studios, and networks — and gives them leverage, expertise, and tools that will help make HBG's ad buying as impactful as it can possibly be."