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
Twice in a Lifetime
eXistenZ
Jason X
The Brood
Naked Lunch
Prom Night
Rabid
Scanners
125 Rooms of Comfort
Partners
It Seemed Like a Good Idea at the Time
Winter Kept Us Warm
984: Prisoner of the Future
One Night Stand
The Ruining
Caressed