Robin Sachs
From Tardis Wiki, the free Doctor Who reference
Robin Sachs (5 February 1951-1 February 2013) played an unnamed British professor in the Torchwood story The New World. He was the son of Doctor Who guest star Leonard Sachs.
Sachs was perhaps best known for his recurring role as Ethan Rayne in the television series Buffy the Vampire Slayer.