Gregory J. Markopoulos (March 12, 1928 - November 12, 1992) was an American experimental filmmaker. Born in Toledo, Ohio to Greek immigrant parents, Markopoulos began making 8 mm films at an early age. He attended USC Film School in the late 1940s, and went on to become a co-founder — with Jonas Mekas, Shirley Clarke, Stan Brakhage and others — of the New American Cinema movement. He was as well a contributor to Film Culture magazine, and an instructor at the Art Institute of Chicago.
In 1967, he and his partner Robert Beavers left the United States for permanent residence in Europe. Once ensconced in self-imposed exile, Markopoulos withdrew his films from circulation, refused any interviews, and insisted that a chapter about him be removed from the second edition of Visionary Film, P. Adams Sitney's seminal study of American avant-garde cinema. While he continued to make films, his work went largely unseen for almost 30 years.

Heads
1969 · as Self

Diaries, Notes, and Sketches
1968 · as Self

Birth of a Nation
1997 · as Self

From the Notebook of...
1972 · as Himself

A Christmas Carol
1940 · as Ebenezer Scrooge

Dionysus
1964

The Illiac Passion
1967 · as Narrator / The Filmmaker

The Hedge Theater
2002 · as Himself

Political Portraits
1969 · as Narrator (voice)

Award Presentation to Andy Warhol
1964 · as Self

Swain
1950 · as the protagonist, Swain

The Painting
1972

Winged Dialogue
1967

Early Monthly Segments
2003

Spiracle
1967

The Dead Ones
1967 · as Paul

The Death of Hemingway (An Obituary Fantasy)
1965 · as Narrator (voice)

Sotiros
2000