Robin David Sachs was an English actor.
Personal life:
Sachs was born in London to actors Leonard Sachs, who was born in South Africa, and Eleanor Summerfield. He was twice married: first to Welsh actress Siân Phillips (1979–1991) and, secondly, to Casey Defranco. Sachs was known for his role as sorcerer Ethan Rayne in Buffy the Vampire Slayer.

He died from a heart attack on 1 February 2013. During the last weekend of February 2013, the month in which Robin Sachs died, a Mass Effect 3 multiplayer challenge was enacted: "Operation Tribute".

TV, filmography, and voice work:
Vampire Circus (1972) – Heinrich
Henry VIII and His Six Wives (1972) – Thomas Culpepper
The Disappearance (1977) - Young Man
Brideshead Revisited (1981) - Old Etonian at Window
Dynasty: The Reunion (1991) – Adam Carrington
Babylon 5 – Na'Tok / Hedronn / Na'Kal (guest appearances)
Buffy the Vampire Slayer – Ethan Rayne (guest appearances; 4 episodes)
The Lost World: Jurassic Park (1997) - Mr. Bowman
Ravager (1997) – Dr. Shepard
Babylon 5: In the Beginning (1998) – Coplann
Galaxy Quest (1999) – General Roth'h'ar Sarris
Ocean's Eleven (2001) - Seller
Star Trek: Voyager (2001) – General Valen (In "The Void")
Megalodon (2002) – Peter Brazier (the CEO of Nexexcon)
Northfork (2003) – Cup of Tea
Star Wars: Knights of the Old Republic – Admiral Saul Karath
SpongeBob SquarePants (2006) – Sergeant Roderick (In "Mrs. Puff, You're Fired".)
Dragon Age: Origins (2009) – Murdock, Seneschal Varel, Lord Pyral Harrowmont, Experienced Human Male Warden
Mass Effect 2 (2010) – Zaeed Massani
Torchwood: Miracle Day (2011) – British professor
Mass Effect 3 (2012) – Zaeed Massani
Resident Evil: Damnation (2012) – Ataman
Mass Effect 3: Citadel (2013) – Zaeed Massani

Source: wikipedia.org