Warren Gard attended the public schools of his home. After a subsequent law studies at the Cincinnati Law School and was admitted as an attorney of his 1894 he began to work in Hamilton in this profession. Between 1898 and 1903 he was a prosecutor in Butler County; 1907-1912 he worked as an appellate judge. Politically, he was a member of the Democratic Party.
In the congressional elections of 1912 Gard was the third electoral district of Ohio in the U.S. House of Representatives in Washington DC chosen, where he became the successor of James M. Cox on March 4, 1913. After three re- elections, he was able to complete in Congress until March 3, 1921 four legislative sessions. In this time of the First World War fell. In addition, at that time the 16th, the 17th, the 18th and the 19th Amendment to the Constitution were ratified.
At times, Gard was a member of the Judiciary Committee. In 1920 he gave up another candidacy. After the end of his time in the U.S. House of Representatives, he practiced as a lawyer again. In 1922 he applied unsuccessfully to return to Congress. Warren Gard died on 1 November 1929 in Hamilton, where he was also buried.