Stephen Bechtel Jr., 95, the third generation of his family to head international construction firm Bechtel Corp, died in his Pacific Heights penthouse on Monday, according to the company. The Stanford-educated engineer was the grandson of company founder Warren Bechtel.

Bechtel was the firm’s chief executive officer for 30 years beginning in 1960. During that time, sales grew 11-fold and the workforce five-fold, with the number of major projects going from 18 to 119, according to Reuters. He expanded its global footprint with work on the Channel Tunnel linking Britain and France, and Saudi Arabia’s King Khalid airport. In addition to the firm’s work for the U.S. government, Bechtel also oversaw contracts for a nuclear power plant in California, Saudi Arabia’s Jubail and Canada’s James Bay hydroelectric project.