I’m sorry, this may be a stupid question but who is Matthew Warshaw? David’s friend or someone connected to his work (album, book, tv, etc)?

Yes, he’s David’s friends. I saw him for the first time during his European tour. He was helping with the logistics, holding fan’s coats and purses during the meet and greets. Very nice guy. I think he follows him on tour a lot and it seems like they hang out a lot together lately.