Keith Hartstein, president and chief executive of John Hancock Funds, will be retiring in September 2012 after 22 years at the firm, Money Management Executive has learned.

According to a statement from the firm, “Hartstein has played a pivotal role in establishing the company’s mutual fund franchise successfully transforming it into one of the fastest growing and diverse mutual funds companies in the U.S. Under his direction, the business achieved record sales, elevated assets under management to record highs, and amassed an impressive list of top performing funds within an industry leading multi-manager investment platform.”

Before taking on his current role, Hartstein was executive vice president of retail sales and marketing for John Hancock Funds, and served in leadership capacities with the Investment Company Institute and the Mutual Fund Education Alliance, among others.

Beth McGoldrick, a firm spokesperson, said a search is underway for Harstein’s replacement.