Jack Morton Buys Planet Interactive

Jack Morton Worldwide, an Interpublic Group branding agency , has bought Planet Interactive, a developer of Web sites, CD-ROMs and digital media, for an undisclosed price.

The acquisition — the third in a year for New York-based Jack Morton — is designed to bolster its digital design and production operations on the East Coast, said Josh McCall, president and chief operating officer.

Founded seven years ago by partners Joan DeCollibus, Glenn Johanson and David Willoughby, Boston-based Planet Interactive employs 30 people and counts Lotus, Gillette and the Smithsonian Institution among its clients.

With interactive agencies floundering lately, larger companies looking to boost their digital offerings have a buyer’s market. Earlier this week, WPP Group bought digital shop Imaginet, which will operate as a unit of J. Walter Thompson. Last October Tonic 360 was acquired by J. Walter Thompson. Last week, Cordiant Communications Group bought i-agency MicroArts for its e-business arm CCG.XM.