In April 1995, Healey was recruited to join
Affiliated Managers Group (AMG), then a three-person start-up firm seeking to invest in boutique money managers. With Healey on board, AMG received its second round of capital and subsequently invested in several
U.S.-based investment firms. By October 1996, AMG had approximately $18 billion under management. In November 1997, Healey led AMG’s initial public offering in which the company raised $176 million, priced at $23.50 per share. With proceeds from the offering, AMG continued to expand, and named Healey president and chief operating officer in October 1999. In 2001, AMG was named in Fortune magazine’s list of 100 Fastest-Growing Companies and had approximately $81 billion in assets under management. Healey became president and chief executive officer in 2005, and chairman and chief executive officer in 2011. Healey also helped AMG to expand globally. After AMG posted three-year average earnings growth of 40%,
Fortune magazine again named AMG to its list of 100 Fastest-Growing Companies in 2012. In May 2018, Healey was diagnosed with
amyotrophic lateral sclerosis (a motor neuron disease otherwise known as ALS, or Lou Gehrig's disease) and AMG announced that Healey was stepping back to become Executive Chairman while Nate Dalton, AMG's long-time President and Chief Operating Officer, was named CEO. ==The Healey Center for ALS==