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Jason is currently married to BBC documentary filmmaker Emma Hewitt and has two daughters, Lily and Ruby.
Isaacs watched Tom Felton's performance as Draco Malfoy in the first film, Harry Potter and the Philosopher's Stone, in order to understand how he should play Draco's father. Isaacs is doing both voices of Leland Turbo and Siddeley in a Disney Pixar 2011 film, Cars 2. As well as Lucius Malfoy he has also played Ra's al Ghul, Satan and at one point Captain Hook
In 2012, he played LAPD detective Michael Britten in the American television series Awake, and was also one of the show's producers. The series was cancelled in May due to low ratings.
He voices the character Admiral Zhao in Avatar: the Last Airbender series, playing an arrogant and proud man who, like Lucius, believes in the "superior race" and is very loyal to the main villain. He also appears as the villainous British colonel in the movie The Patriot.
He also voices a character in the 2005 video game Spartan: Total Warrior as Lucius Aelius Seianus (Sejanus) The Praetorian Prefect, cunning and completely amoral with no concerns other then his own power and ambition. Rumours of his knowledge of dark magic abound.
He was caught attempting to take Lucius Malfoy's first wand from the set, but wouldn't say what he wanted it for.[2]
"I went off and read the books after the audition and I read all four books in one sitting - you know - didn't wash, didn't eat, drove around with them on the steering wheel like a lunatic. I suddenly understood why my friends, who I'd thought where slightly backward, had been so addicted to these children's books. They're like crack." - on Harry Potter.
"Everytime I make a plan, God laughs at me."
"Look, I play all these tough guys and thugs and strong, complex characters. In real life, I am a cringing, neurotic Jewish mess. Can't I for once play that on stage?"