It could be trending away from that, but historically https://www.ycombinator.com/ https://www.ycombinator.com/ is the center of bay area startup culture, and t

It could be trending away from that, but historically https://www.ycombinator.com/ https://www.ycombinator.com/ is the center of bay area startup culture, and then those startups grew into bay area tech culture as a whole. Ycombinator comes from Stanford which centers around creating CEOs, creating most of the companies in the bay area. Most non-yc bay area companies still have Stanford at its roots. I don't have a direct data point, but almost every company I've interviewed for in the last 10 years and have worked with, their CEO or CTO or some other c-suite "club" is strongly tied to Stanford and from that directly or indirectly tied to YC.