That is David Taylor. He is one of the best bass trombonists. He is known for playing jazz bass trombone. I have a recording of him playing Ewazen's Concertino for Bass Trombone and Trombone Choir. All I can say is wow! Wish I could meet him!
These 2 are the current standards for tenor and bass bone players. It takes study, work, more study, a ton of practice, etc. Very unlike playing something that you plug into an amp and pluck or strum...