Who is Larry Summers from The Accidental Billionaires: The Founding of Facebook: A Tale of Sex, Money, Genius and Betrayal and what is their importance?

Larry Summers was the President of Harvard University when the Winklevoss twins submitted a letter of complaint about Zuckerberg's violation of the school's ethics standards. Summers dismissed the complaint and told the twins the matter was between them and Zuckerberg.