Albert Maysles was an American documentary filmmaker best-known for the documentaries Gimme Shelter (1970) Grey Gardens (1975).
He is best known for the direct cinema/cinéma vérité – documentaries he made with his brother.
You can watch Gimme Shelter and Grey Gardens in their totalities on YouTube. And Salesman too (practically).
If your new to the Maysles, I’d start with Grey Gardens, the story of an eccentric mother and daugther.