Morrison has occasionally acted in other directors' films, notably Andrew Bujalski's Mutual Appreciation and its quasi-sequel Peoples House.
Morrison has collaborated with some of the most influential composers and performers including John Adams, Gavin Bryars, Bill Frisell, Philip Glass, Michael Gordon, Henryk Górecki, Jóhann Jóhannsson, Kronos Quartet, David Lang, Steve Reich, Michael Harrison, Maya Beiser, Julia Wolfe and Michael Montes among many others.