For 25 years, Chris Anderson has been the maestro of wit, wisdom, and, sometimes, gooey blather that is TED. Since he took over the reins of the small but influential annual conference of “technology, entertainment and design” in 2000, he’s built it into a renowned, if sometimes mocked, conglomerate of “ideas worth sharing” that includes a heavily trafficked YouTube channel, thousands of locally licensed gatherings called TEDx, and an archive of over a quarter million talks, including those from...