:''This article is about the mayor of Pittsburgh, for other people named William Diehl see William_Diehl_(disambiguation).'' "William J. Diehl" (January_22, 1845–September_22, 1929), served as Mayor_of_Pittsburgh from 1899 to 1901. ==Early life== Mayor Diehl was born in 1845 and worked as a bookeeper in his early career. He entered the public service as a Deputy Sheriff for four years followed by work in the city treasury office in the 1870's. His main fortune was in the oil and gas industries around the region. Diehl was also a thirty-third degree Mason. ==Pittsburgh politics== During his two years as mayor, Diehl oversaw a city growing to its full commercial and industrial potential. The ritzy and exclusive business forum Duquesne_Club was founded in the city, as well as the amalgamation of Andrew_Carnegie's vast industrial empire into U.S._Steel was completed. Mayor Diehl's administration successfully completed the rudimentary expressway Bigelow Boulevard to the east neighborhoods of the city. {{seealso|List of Mayors of Pittsburgh}} ==Later life== Mayor Diehl died in 1929 and is buried in Allegheny_Cemetery in Pittsburgh. {{start box}} {{succession box | before=Henry_P._Ford | title=Mayor_of_Pittsburgh | years=1899–1901| after=Adam_M._Brown}} {{end box}} ==References== Diehl ,William J. Diehl ,William J. Diehl ,William J.