Marsh & McLennan Cos., the second- largest insurance broker, said Vanessa A. Wittman is stepping down as chief financial officer to take a senior job at Google Inc. (GOOG)

Michael Bischoff, the vice president of corporate finance, will become interim principal financial officer, the New York- based company said in a regulatory filing today.

To contact the reporter on this story: Dan Kraut in New York at dkraut2@bloomberg.net

To contact the editor responsible for this story: Gregory Mott at gmott1@bloomberg.net