Marion Harper, who replaced McCann as President-CEO in 1948, went on to create Interpublic Group in 1960, as the first marketing services management holding company.

UM was originally launched in Australasia, under the direction of Murray Gardner and Rob Langtry and grew and evolved by McCann Worldgroup as a worldwide media buying arm operating with Sasa Savic as vice president of international media,[7] as a separate yet interdependent unit.

UM's global headquarters is in New York with six other locations in North America: Dallas, Detroit, Los Angeles, Miami, San Francisco and Toronto.

UM has regional offices in Asia-Pacific, Latin America, Europe, Middle East and Africa.

This approach supports a consistent product across markets, centralizes teams, and reduces operational costs.