Roberts' special effects and visual effects credits include SPAWN OF THE NORTH (1938), FOR WHOM THE BELL TOLLS (1943), A CONNECTICUT YANKEE IN KING ARTHUR'S COURT and THE GREAT GATSBY (both 1949), THE WAR OF THE WORLDS and THE GIRLS OF PLEASURE ISLAND (both 1953), REAR WINDOW (1954, uncredited), CONQUEST OF SPACE (1955) and THE COURT JESTER (1956). Roberts also worked as a second unit camera operator or director of photography on ELEPHANT WALK (1954), VERTIGO (1958, uncredited), HELLER IN PINK TIGHTS (1960), GIRLS! GIRLS! GIRLS! (1962) and IT'S A MAD MAD MAD MAD WORLD and FUN IN ACAPULCO (both 1963). Roberts is credited with developing the dolly-in/zoom-out shot used in Alfred Hitchcock's VERTIGO.  Special Award 1938: "For outstanding achievement in creating special effects in the Paramount production, SPAWN OF THE NORTH." Winners presented Plaques. (w. Devereux Jennings, Gordon Jennings, Jan Domela & Art Smith)  Special Effects 1953: THE WAR OF THE WORLDS [No credit listed, but film credits Jan Domela, Walter Hoffman, Gordon Jennings, Irmin Roberts & W. Wallace Kelley (visual)] 1 nomination, 1 Award, 1 Special Award