"There is no plan to ease the entry into the AI era," Gates writes in an essay.
"It was a huge mistake to spend time with him, to give him the credibility of being there," Gates said.
Buffett was one of only three trustees at the foundation -- the other two being Bill and Melinda Gates, who are in the process of divorcing.
"Our focus on our culture, our diversity, our inclusion, in particular, the everyday experience of our people is super important, it's a huge priority," Microsoft CEO Satya Nadella said.
A Moreno Valley teen, the daughter of immigrants, is realizing a childhood dream after being accepted to Harvard and 16 other schools and earning a full scholarship from the Gates Foundation.
Bill and Melinda Gates have been in the process of getting divorced for two years, according to The Wall Street Journal, and one factor was revelations that Bill had spent time with Jeffrey Epstein.