  HISTORY For 146 years, we have grown by helping our clients anticipate and meet the challenges of changing times and technologies. We are an organization forged by change, defined by deep specialization, and united by a uniquely collaborative culture. The scope of our enterprise has grown, but we've always been a company of far-sighted individual talents who thrive on working together. A DECADE-BY-DECADE LOOK AT OUR JOURNEY LEARN MORE OUR FOUNDERS' STORIES Colleagues describe the founders of Marsh & McLennan Companies as "restless spirits" who saw vast new opportunities in the challenges of their times and moved with dispatch to seize them. Henry Marsh and Donald McLennan THE POWER OF COMPLEMENTARY PERSONALITIES Guy Carpenter THE POWER OF DATA William Mercer THE POWER OF CUSTOMIZATION Alex Oliver and Bill Wyman THE POWER OF SPECIALIZATION WE REMEMBER & HONOR On September 11, 2001, 295 colleagues and 63 consultants working in our offices were lost in the terrorist attacks on the World Trade Center. They were loved ones, good friends, and valuable colleagues, and their memory — and legacy — will live forever in our hearts. VISIT MEMORIAL SITE MARSH GUY CARPENTER MERCER OLIVER WYMAN TERMS OF USE | PRIVACY POLICY | SITEMAP   © 2017, MARSH & MCLENNAN COMPANIES, INC., ALL RIGHTS RESERVED.