Armin Shimerman (born November 5, 1949) is an American actor known for his role as Quark in the Star Trek franchise, appearing as the character in all seven seasons of Star Trek: Deep Space Nine (1993–1999). He also had a recurring role as Principal Snyder in the first three seasons of Buffy the Vampire Slayer (1997-1999), and voiced General Skarr and other characters in the animated series The Grim Adventures of Billy & Mandy (2001–2007), Doctor Nefarious in the Ratchet & Clank video game series, and Andrew Ryan in the BioShock video game series. Source: Wikipedia (en)