
"Big Joe" Roberts, as he was known in vaudeville, toured the country with his first wife, Lillian Stuart Roberts as part of a rowdy act known as Roberts, Hays, and Roberts. Their signature routine was called "The Cowboy, the Swell and the Lady." At this time, in the first decade of the twentieth century, Buster Keaton's father, Joe Keaton, had started a summer Actors' Colony for vaudevillians between Lake Michigan and Muskegon Lake in Michigan. Roberts became acquainted with the Keaton family as a member of this community.
When Buster Keaton's film apprenticeship years with Roscoe "Fatty" Arbuckle came to an end, and Keaton began making his own shorts in 1920, he asked Roberts to join him. Roberts' hefty 6'3" frame, usually playing a menacing heavy or authority figure, made a striking and amusing contrast to the thin, 5'6" Keaton.
IMDB shows that Roberts made only two films without Keaton. He played the role of "Roaring Bill" Rivers in 1922's The Primitive Lover starring Constance Talmadge—Keaton's sister-in-law—and the silent film actor Harrison Ford; and a drill master in the Clyde Cook comedy The Misfit,[4] released in March 1924, after Roberts' death.
When Keaton began making feature films in 1923, he apparently intended to continue working with Roberts. Roberts had roles in Keaton's Three Ages and Our Hospitality (both 1923). During the filming of the second feature, Roberts had a stroke but insisted on returning to the set to finish the film. After completion, Roberts suffered another stroke and died shortly afterwards.

One Week
1920 · as Piano Mover (uncredited)

A Brave Engineer: Buster Keaton's Last Ride
2026 · as Self (Archival)

The Goat
1921 · as Police Chief

Our Hospitality
1923 · as Joseph Canfield

Three Ages
1923 · as The Girl's Father

Hard Luck
1921 · as Lizard Lip Luke

My Wife's Relations
1922 · as Brother

The Scarecrow
1920 · as Farmhand (uncredited)

The Haunted House
1921 · as Bank Cashier

The High Sign
1921 · as Leader of Buzzards

Cops
1922 · as Police Chief (uncredited)

The Frozen North
1922 · as The Driver

The Misfit
1924 · as The Drill Master

The Paleface
1922 · as The Indian Chief

Neighbors
1920 · as Her Father (uncredited)

Little Lord Fauntleroy
1921 · as Buzz Saw Brannigan (uncredited)

The Play House
1921 · as Actor / Stage Manager (uncredited)

The Love Nest
1923 · as Captain of the Whaler