The Aegis Group in London is revamping by placing its two media-agency networks, Carat and Vizeum, in a new division intended to increase their buying power and consolidate back-office operations. Doug Flynn, 53, chief executive at Aegis, was named to the added posts of chairman and chief executive of the new division called Aegis Media. David Verklin, 46, chief executive at Carat North America in New York, was named to the newly created position of regional chief executive at Aegis Media for North America and Latin America. In March, Aegis began combining many local and regional media agencies under the Vizeum name, to create a worldwide network that clients could use as an alternative to Carat, the flagship. Vizeum, now made up of 17 European agencies, is to be extended to North America and other regions starting later this year.