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