Harvard MBA co-founded King Street Capital Management in 1995 with fellow First Boston alum Brian Higgins, who worked with him on the special situations fund. With more than $21 billion in client assets, King Street focuses on out-of-favor investments in stocks and bonds but racked up a slight loss for investors in 2015 as markets gyrated. Biondi is married to former Forstmann Little partner Jamie Nicholls. Charity he and Higgins run has ballooned to more than $90 million in assets with big recent gifts to a Harlem youth program and Biondi's alma mater Yale.