Johnathan Aitken was scouted as a big tough defensive defenseman while playing in the Western Hockey League. After splitting his junior career between the Brandon Wheat Kings and Medicine Hat Tigers, Aitken was drafted in the first round, 8th overall by the Boston Bruins in 1996. He played with the Bruins minor league affiliate in Providence for two seasons and got his first taste of NHL hockey in 1999-2000, playing in 3 games for the Bruins. He then moved around the minors, playing in the Czech Republic for Sparta Praha, in the ECHL and back in the AHL. In 2003-04 he was back in the National Hockey League with the Chicago Blackhawks and ended up playing in 41 games.