text: This man employed Bella de Costa Greene to create a massive personal library, where he once locked his colleagues until 5:00 AM to force a deal during a crisis that prompted the Aldrich-Vreeland Act.
full_question: This man employed Bella de Costa Greene to create a massive personal library, where he once locked his colleagues until 5:00 AM to force a deal during a crisis that prompted the Aldrich-Vreeland Act. George Cortelyou was forced to rely on this man to that incident, which was triggered by the Hepburn Act and F. Augustus Heinze's failed bid to corner the copper market. This man died shortly after testifying before the Pujo Committee, and he organized banker intervention to end the Panic of 1907. For 10 points, name this financial magnate who oversaw the creation of G.E. and U.S. Steel, and whose namesake company later merged with Chase Manhattan Bank.
first_sentence: This man employed Bella de Costa Greene to create a massive personal library, where he once locked his colleagues until 5:00 AM to force a deal during a crisis that prompted the Aldrich-Vreeland Act.
raw_answer: John Pierpont Morgan