Altman joins the WPP media agency from Carat, where he is the commercial director.
His appointment follows a search for senior talent to join MEC after the departure of its joint managing director Toby Jenner in April to join MediaCom Australia.
Steve Hatch has been confirmed as the agency's managing director.
A former MEC head of strategy, he was previously the joint managing director with Jenner.
Altman, who spent 14 years at Carat and also worked at MediaCom and Mindshare, will report directly to
Tom George, the MEC chief executive. Altman occupied senior roles at Carat, including head of comms planning and managing director of its Carat Business unit. He became the commercial director in 2006.
George said: "In Alex, we have a talented individual with a wide range of business development, commercial, planning, client service and B2B experience."
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