Mr. Tan replaces Robert Mitchell, who retired this summer.
Mr. Tan was senior vice president. He will now report to John DeMairo, chairman and CEO.
Also, Kathleen Pabla was named vice president and director of research, and Nino Boezio was named vice president, portfolio strategist and consultant. Both positions are new and they will report to Mr. Tan, Ms. Feldman said in an e-mail.
Ms. Pabla was director of investment research and analysis in investment management services for Manulife Financial. Spokeswoman Laurie Lupton could not immediately be reached for information on her replacement.
Mr. Boezio was senior manager, managed products business development, at TD Bank Financial Group. Spokesman Stephen Knight said TD Bank does not comment on personnel moves.