New York--J.P Morgan Chase & Co. Chairman Douglas Warner III will retire by the end of the year. Warner, formerly chairman-CEO of J.P. Morgan & Co., was the driving force behind the decision to have the J.P. Morgan brand take precedence over Chase Manhattan Bank Corp.'s moniker when the two banks announced their intention to merge in September 2000. J.P. Morgan Chase President-William Harrison Jr., formerly chairman-CEO of Chase Manhattan Bank, will assume Warner's chairman title. Since the merger was completed earlier this year, the bank has enhanced its b-to-b focus and merged most of its e-commerce activities into LabMorgan, its Internet unit. Most of the bank's b-to-b advertising now runs under the J.P. Morgan Chase brand.