Thomas J. O'Brien (Illinois politician)

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Thomas Joseph O'Brien (1878 - 1964) of Chicago was a U.S. Representative from Illinois, 1933–39, 1943-64. He was of the Democratic Party.[1] He became the "Dean" of Chicago delegates and played a role in the early career of Dan Rostenkowski.[2]

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.