2018 San Francisco mayoral special election
Ed Lee, who was appointed Mayor of San Francisco in 2011 following Gavin Newsom's election as Lieutenant Governor of California, elected to a full term in 2011, and reelected in 2015, died of cardiac arrest on December 12, 2017. London Breed, the President of the San Francisco Board of Supervisors, became the city's acting mayor.
George J. Whelan
George J. Whelan (birth and death dates unknown) served as the eighth Mayor of San Francisco in from July 8 to November 15, 1856. He had been a lawyer and before serving as mayor. He actually was chosen mayor by justices of the peace who were acting as the County Board of Supervisors. His brief term was marred by the vigilance movement, Chinese immigration issues, collecting back taxes from the city's most prominent citizens of the day, and uncooperative elected officials. His last act as mayor was to give a farewell address in which members of the soon-to-be-inaugurated Burr administration refused to attend.