How many movies have Len Dell'Amico and Phil Lesh collaborated on?

They have worked on 9 movies together! Their first movie together was Grateful Dead: Dead Ahead (1981) while their highest rated movie together was Grateful Dead: Ticket to New Year's Eve Concert (1987). They have not worked together since Grateful Dead: Crimson, White & Indigo (2011). They are most known for their music films together.