BILL JOY co-founded Sun Microsystems in 1982 along with Vinod Khosla, Scott McNealy, Andy Bechtolsheim and Vaughan Pratt, and served as chief scientist at the company until 2003. He is widely known for having written the essay "Why the future doesn't need us", where he expresses deep concerns over the development of modern technologies.
In 1999 Joy co-founded a venture capital firm, HighBAR Ventures, with two Sun colleagues: Andreas Bechtolsheim and Roy Thiele-Sardiña. In January 2005 he was named a partner in venture capital firm Kleiner Perkins Caufield & Byers.
He is Partner Emeritus, Greentech Venture Group, KPCB, and a member of the American Academy of Arts and Sciences and the National Academy of Engineering.