Robert A. Silverman is a Canadian actor cast five times by writer/director David Cronenberg. He is sometimes credited as Bob Silverman or Robert Silverman. Wikipedia
The Ruining (2004)
Jason X (2001)
eXistenZ (1999)
Waterworld (1995)
Naked Lunch (1991)
984: Prisoner of the Future (1982)
Scanners (1981)
Prom Night (1980)
The Brood (1979)
One Night Stand (1978)
Rabid (1977)
Partners (1976)
It Seemed Like a Good Idea at the Time (1975)
125 Rooms of Comfort (1974)
Winter Kept Us Warm (1965)
Sweet Substitute (1964)