Douglas 'Sandy' Warner is an American banker who joined Morgan Guaranty Trust Company of New York out of college in 1968 as an officer's assistant and rose through the ranks to become chief executive officer and chairman of the board of J.P. Morgan & Co. Inc. in 1995. Among his many accomplishments, Warner may be best known for spearheading the 2000 sale of J P Morgan & Co. to Chase Manhattan Bank for $30.9 billion.