Theresa Hamacher resigned as chief investment officer at Pioneer Investments, which is being integrated into UniCredito Italiano. The firm will be known as Pioneer Global Asset Management. Ms. Hamacher, CIO since 1997, will not be replaced, said Denise Robbi-Arena, Pioneer spokeswoman.
Global investment operations at Pioneer Global are headed by Giordano Lombardo, global CIO. "We are disappointed that Theresa has decided to resign, but respect and understand her decision, Mr. Lombardo said in a statement.
Ms. Robbi-Arena said the integration of Pioneer would have changed Ms. Hamachers role as U.S. CIO.
Ms. Hamacher could not be reached for comment.