Keller, who fills the post left by Patrick Mortimer in March, will continue to serve as head of Americas finance sales at Morgan Stanley.
Keller, a managing director, joined Morgan Stanley in 1994. He has served in several equity sales roles and offices, including four years in London, eight years as head of the Boston office, and three years as head of U.S. cash sales in the Americas. Prior to Morgan Stanley, he served in similar equity-financing sales roles with Lehman Brothers and E.F. Hutton, according to the memo.