Charlie is brilliant. I've worked with him for years, starting as classmates at Harvard (https://www.quora.com/What-was-it-like-to-be-at-Harvard-with-Charlie-Cheever). His transparency no bs attitude always cuts to the core issues and he can abstract away all the small details to really focus on the bigger issues that matters. He can also switch to the details. This is exceptionally rare. He's an inspiring leader to all the engineers that get an opportunity to work with him.