Report From Spitzer Says Ex-Chief Of A.I.G . Defrauded Foundation Eliot Spitzer , the New York attorney general , submitted a report as part of his lawsuit against Maurice R. Greenberg , the former chief executive of American International Group , contending that Mr. Greenberg unfairly enriched himself and other A.I.G . executives in a series of transactions that violated the will of Cornelius Vander Starr , the company 's founder , and defrauded a foundation he created .