Thomas Joseph O'Brien (April 30, 1878 – April 14, 1964) of Chicago was a U.S. representative from Illinois, 1933–39, 1943–64, and as Cook County Sheriff from 1938 through 1942. He was a liberalCongressional Record Proceedings and Debates of the ... Congress · Volume 110 By United States Congress, 1964, P.8859 member of the Democratic Party.Biographical Directory of the United States Congress He became the "Dean" of Chicago delegates and played a role in the early career of Dan Rostenkowski.Mr. Chairman by James L. Merriner, pg 93
O'Brien died in office of a stroke on April 14, 1964, and was buried at Queen of Heaven Cemetery in Hillside, Illinois.
The T.J. O'Brien Lock and Dam approximately 7 miles from Lake Michigan on the Calumet River in Chicago at the head of the Illinois Waterway is named after Congressman O'Brien.
See also List of members of the United States Congress who died in office (1950–1999)
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