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
Pacific Blue
Friday the 13th: The Series
Waterworld
Jason X
Twice in a Lifetime
eXistenZ
Scanners
The Brood
Naked Lunch
Prom Night
Rabid
It Seemed Like a Good Idea at the Time
125 Rooms of Comfort
Partners
984: Prisoner of the Future
One Night Stand
The Ruining
Caressed