Scott Aaronson is probably one of the most underrated scientists of our time. He's very approachable and has responded to comments and emails of undergrads like me in a few hours. Not only is he part of the team that practically invented quantum supremacy, but his blog is the most informative blog out there for ethics, morality, nerdiness, theoretical computer science and the philosophical implications of complexity theory.

Y Combinator had a podcast with him which you can watch here: https://www.youtube.com/watch?v=0jrybODBUpA