Christopher Plummer (December 13, 1929 – February 5, 2021[1]) was a Canadian actor whose career spanned several decades; his breakthrough role being Captain Georg von Trappe in the film The Sound of Music; Plummer also appeared in films such as Waterloo, Beginners, and Knives Out, among others.
For Pixar, he performed the voices of both Charles F. Muntz and Young Muntz in Up.