|Character||Dr. Stephen Whiticus|
|Birthday||February 7, 1967|
|Birth Place||Prague, Czechoslovakia [now Czech Republic]|
David Nykl is a Czech-born Canadian actor, who plays Dr. Stephen Whiticus on Eureka. He is best known for his recurring role as Radek Zelenka on Stargate Atlantis, a character originally intended to be Russian, but which was rewritten to take advantage of David's native Czech. More recently he was the Bratva founder Anatoly Knyazev on Arrow.