Enpocket, a mobile phone-based marketing agency has named Michael Baker, the firm's president and chief operating officer, has been named CEO. The position took effect Oct. 30.

He replaces Peter Larsen, who resigned his post as an officer and director of the company to pursue other interests, the company said.

In other news, the Boston-based company promoted David Barker to managing director-Europe. Barker is based in the London office.

Enpocket's clients include Vodafone, Cingular, Sprint, Verizon, Orange, Telefonica, Singtel, Nokia, Sony, BBC, Fox, Time Warner, Universal Pictures, Time Out, Match.com, Snapple, Levi's, Hallmark and Nike.