Made his NHL debut in 2008 at the age of 18 and was named to the All-Rookie Team.
Is a professional ice hockey defenceman, who plays for the Los Angeles Kings of the National Hockey League (NHL).
Won the 2015-2016 Norris Trophy as the NHL's top defenceman. It was his third nomination; Finished second in voting in 2014-2015 and third in 2009-2010.
Selected by the Guelph Storm fifth overall in the 2005 Ontario Hockey League (OHL) Priority Selection draft. He scored five goals and 33 points for the Storm in 2005-2006 and was named to the OHL All-Rookie Team on defence.