Instead of attending Harvard University, Taylor became an apprentice patternmaker and machinist, gaining shop-floor experience at Enterprise Hydraulic Works in Philadelphia (a pump-manufacturing company whose proprietors were friends of the Taylor family). He left his apprenticeship for six months and represented a group of New England machine-tool manufacturers at Philadelphia's centennial exposition. Taylor finished his four-year apprenticeship and in 1878 became a machine-shop laborer at Midvale Steel Works. At Midvale, he was quickly promoted to time clerk, journeyman machinist, gang boss over the lathe hands, machine shop foreman, research director, and finally chief engineer of the works (while maintaining his position as machine shop foreman). Taylor's fast promotions reflected both his talent and his family's relationship with Edward Clark, part owner of Midvale Steel. (Edward Clark's son Clarence Clark, who was also a manager at Midvale Steel, married Taylor's sister.)