Now that he is has left the Fed and has written his book, Bernanke says more individuals should have gone to prison:

http://www.usatoday.com/story/news/politics/2015/10/04/ben-bernanke-execs-jail-great-recession-federal-reserve/72959402/

With publication of his memoir, The Courage to Act, on Tuesday by W.W. Norton & Co., Bernanke has some thoughts about what went right and what went wrong. For one thing, he says that more corporate executives should have gone to jail for their misdeeds. The Justice Department and other law-enforcement agencies focused on indicting or threatening to indict financial firms, he notes, “but it would have been my preference to have more investigation of individual action, since obviously everything what went wrong or was illegal was done by some individual, not by an abstract firm.”