Known to be affiliated with GAP, William S. Fisher is an American businessman with an estimated net worth of $1.36 billion as of April 2016 according to Forbes. Since 2009, William Fisher has been serving as the director of GAP Inc. He is also one of the founders of Manzanita Capital Limited where he currently serves as the Chief Executive Officer. Manzanita Capital Limited is a private equity firm currently based in London.

Of Jewish ancestry, William Fisher was born in 1958 in the U.S.A. He was born to Don Fisher and Doris Feigenbaum Fisher who are considered as the co-founders of GAP Inc. He is an alumnus of Phillips Exeter Academy and Princeton University. He completed his Master's of Business Administration degree from Stanford University School of Business in 1984. He is currently married to Sakurako Fisher with whom he has three children.

After finishing his MBA, Fisher started working for GAP as Banana Republic's store director. He also became the general manager of Gap in Canada and eventually, the president of the Gap's international division which managed to obtain an expansion to Japan, United Kingdom, UK, France, and Canada.