Marsh & McLennan Companies, Inc. announced that Katherine J. Brennan has been appointed Deputy General Counsel, Corporate Secretary and Chief Compliance Officer. Ms. Brennan’s appointment is effective October 18, 2017. Ms. Brennan will report to Peter J. Beshar, Executive Vice President and General Counsel of Marsh & McLennan, and be based in the company’s New York headquarters. For the past two years, Ms. Brennan has served as Senior Vice President, Deputy General Counsel and Corporate Secretary at S&P Global Inc.