Doug Leone of Sequoia Capital.gettyWhen Doug Leone announced his retirement in 2022 from his role as “senior steward” of storied venture capital firm Sequoia Capital, it was the end of an era. The billionaire venture capitalist had run the fund with Mike Moritz since its founder Don Valentine stepped down in 1996. Now he’s actively making investments again at Sequoia, just four years later, in a newly created “chairman” role, the firm announced Tuesday. Leone’s new position comes after a turbul...