As an improviser I'm now pretty comfortable with trios, so I'm thinking of working up to quartets.
Fred Frith
People know my background and for people who need an improviser, I'm one of the people they think to use if I'm appropriate for the part.
Jason Mantzoukas
Vince Vaughn is a master improviser.
Alan Tudyk
You have to know composition to be a good improviser.
Roscoe Mitchell