Jon W. Zindel was named chief financial officer at William Blair & Co., confirmed spokesman Tony Zimmer.
He replaces Tim Burke, who is retiring.
Mr. Zindel will report to John R. Ettelson, president and CEO.
Mr. Zindel was CFO at American Century Investments; he left June 15. He was replaced by Jami Waggoner, who was promoted from vice president of finance, confirmed American Century spokeswoman Laura Kouri.