Biography: Jeffrey Dean Morgan (born April 22, 1966) is an American actor and producer of film and television. He is known for his roles as John Winchester in the CW fantasy horror series Supernatural (2005–2007; 2019), Denny Duquette in the ABC medical drama series Grey's Anatomy (2006–2009), the Comedian in the superhero film Watchmen (2009), Clay in The Losers (2010), Jason Crouse in the CBS political drama series The Good Wife (2015–2016), Negan in the AMC horror drama series The Walking Dead (2016–present), and Harvey Russell in Rampage (2018).