Thomas Corcoran, the son of a lawyer, was born in Rhode Island on 29th December, 1899. He was educated at Brown University and Harvard Law School. Corcoran's most important influence at university was Professor Felix Frankfurter. He wrote that Corcoran was "struggling very hard with the burden of inferiority imposed on him because of his Irish Catholicism". Frankfurter was impressed with Corcoran's progress and introduced him to his close friend, Supreme Court Justice Oliver Wendell Holmes. After graduating in 1926 he was invited by Holmes to become his legal clerk.
In 1927 Corcoran joined the law firm established by William McAdoo. At the time it was run by George Franklin and Joseph Cotton. In 1932 Eugene Meyer, chairman of the Federal Reserve Board, was looking for a general counsel for the newly established Reconstruction Finance Corporation. After talks with Franklin he appointed Corcoran to this post. Meyer resigned in 1933 and was replaced by Jesse H. Jones.
After Franklin D. Roosevelt defeated Herbert Hoover he asked Felix Frankfurter to assemble a legal team to review the nation's securities laws. Frankfurter selected Corcoran, Benjamin Cohen and James Landis for the task. Corcoran, a member of the Democratic Party, readily accepted the post. Together they drafted the legislation that created the Securities and Exchange Commission.
The following year Corcoran was involved in drafting the Public Utilities Holding Company Act. On 1st July, 1935, Owen Brewster claimed that Corcoran threatened to stop construction on the Passamaquoddy Dam in his district unless he supported the Holding Company Bill. Congress immediately ordered the rules committee to investigate the matter. The Senate investigation, headed by Hugo Black, eventually cleared Corcoran of any wrongdoing. Corcoran wrote to a friend: "Storms make a sailor - if he survives them."

Thomas, Howard and David Corcoran
Roosevelt's personal secretary, Louis M. Howe, died of pneumonia on 24th June, 1936. According to Corcoran's biographer, David McKean (Peddling Influence), Corcoran now replaced Howe as Roosevelt's most "trusted adviser and personal companion". Some of Roosevelt's ministers complained about Corcoran's growing influence. Henry Morgenthau, the Secretary of the Treasury, claimed that Corcoran was a "crook".
As well as drafting New Deal legislation, Roosevelt used Corcoran as his "special emissary to Capitol Hill". Elliott Roosevelt wrote that: "Apart from my father, Tom (Corcoran) was the single most influential individual in the country."
In 1937 Corcoran used this influence to make sure Sam Rayburn of Texas became Speaker of the House. This was a difficult task as James Farley was advocating that John O'Connor got the job. Corcoran's increasing power was indicated by the fact that Franklin D. Roosevelt brought an end to Farley's campaign. This was the beginning of a very close relationship that Corcoran enjoyed with Rayburn and the Texas oil industry.
Franklin D. Roosevelt began to have considerable problems with the