Marsh & McLennan Companies announced several changes to its senior management team, including the appointment of Daniel S. Glaser, 50, to the newly created position of group president and chief operating officer, Marsh & McLennan Companies. Glaser had previously been chairman and chief executive officer of Marsh, a position he assumed in December 2007.

Peter Zaffino, 44, has been named president and chief executive officer of Marsh Inc., succeeding Glaser.

In his role as group president and COO, Glaser will have operational and strategic oversight of Marsh & McLennan Companies’ Risk & Insurance and Consulting segments. In addition, he will have responsibility for the company’s technology, business services, and international and client development functions. Glaser will continue to report to Brian Duperreault, president and chief executive officer of Marsh & McLennan Companies.

Prior to joining Marsh, Glaser had been managing director of AIG Europe (U.K.) Limited, and a senior vice president of AIG Inc. Glaser joined Marsh in 1982 and spent the first 10 years of his career in the insurance industry as a Marsh broker.

Zaffino, who is succeeding Glaser as the new president and chief executive officer of Marsh Inc., had been president and chief executive officer of Guy Carpenter, a position he assumed in early 2008. Prior to being named Guy Carpenter CEO, Zaffino held a number of executive management positions within the firm, including executive vice president, head of U.S. Treaty Operations and head of Global Specialty Practices. He has more than 20 years of experience in the insurance and reinsurance industry.

Also, Alexander Moczarski, 55, has been named president and chief executive officer of Guy Carpenter, succeeding Zaffino. Moczarski had been president of the international division of Marsh Inc., responsible for operations in all areas of the world outside the U.S. and Canada. Moczarski, who has more than 30 years of experience in the insurance industry, joined Marsh in 1993 from AIG.

Marsh & McLennan Companies is the parent company of Marsh, the insurance broker and risk advisor; Guy Carpenter, a risk and reinsurance specialist; Mercer, a provider of HR and related financial advice and services; and Oliver Wyman, a management consultancy.