If he often plays villains then it's most likely Charles Dance.
Bob Newhart played Sid Post
NO
John Boxer - British actor - was born on 1909-04-25.
Alan Curtis - British actor - was born on 1930-07-30.
Matthew Beard - British actor - was born on 1989-03-25.
There is more than one who fits these categories. Why dont you just image search the criteria? You might recognise him.
chad
Devon Sawa was a Canadian teenage actor with blonde hair.
http://www.ericviolette.com/index.htm
NO
Bob Newhart played Sid Post
Robyn Moore - British actor - was born in 1960.
Ben Jones - British actor - was born in 1972.
Jack Lambert - British actor - died in 1976-03.
Matthew Beard - British actor - was born on 1989-03-25.
Alan Curtis - British actor - was born on 1930-07-30.
Richard Cambridge - British actor - was born on 1977-07-27.