Born in San Francisco, Schmitz was the son of an Irish mother and a German father. He played the violin and conducted the orchestra at the Columbia Theatre on Powell Street in San Francisco and was president of the Musicians' Union, when city bossAbe Ruef chose him to run for mayor of his hometown on the ticket of the Union Labor Party. Schmitz was elected in 1902, thereafter giving protection to criminals, including houses of prostitution for protection money, while remaining popular with the working class. Despite opposition from a reform candidate backed by a fusion party, he was reelected in 1905. He was still mayor when the 1906 San Francisco earthquake and subsequent fire destroyed a prodigious amount of the city. On the day of the earthquake, Wednesday, April 18, 1906, he invited a cross-section of the city's most prominent businessmen, politicians and civic leaders, but none of the members of the Board of Supervisors, to form the Committee of Fifty to help him manage the crisis. On June 13, 1907, Schmitz was found guilty of extortion, and the office of mayor was declared vacant while he was sent to jail to await sentence. Shortly thereafter, he was sentenced to five years at San Quentin State Prison, the maximum sentence the law allowed. He immediately appealed; while awaiting the outcome, he was kept in a cell in San Francisco County Jail. On January 9, 1908, the District Court of Appeals nullified his conviction. Two months later, the California Supreme Court upheld the Court of Appeals' ruling, and he was released on bail pending the resolution of the outstanding bribery indictments. In 1912, he was brought to trial once more, this time on charges of bribery; however, after Abe Ruef was brought from San Quentin to testify and refused to give evidence, and the other key witness, Chief Supervisor Gallagher, fled to Canada, Schmitz was acquitted. Schmitz ran for mayor again in 1915 and 1919, but was soundly defeated due to his past reputation. Elected to the Board of Supervisors in 1921, he remained until 1925. He was married and had two daughters.