David Weissner has been named Midwest market business leader for Mercer's retirement practice. He will be responsible for business performance, client satisfaction and continued growth. Weissner takes over from Louis Gagnon, who had been in an interim leadership capacity and will return full time to his position as Global and U.S. Head of Retirement Sales. Weissner has been with Mercer for 11 years, most recently as as retirement office business leader in Minneapolis. Before joining Mercer, he was a senior consultant with PricewaterhouseCoopers. He began his career as an actuarial analyst with The Segal Co. Weissner has a bachelor's degree in applied mathematics from the University of Wisconsin - Madison.