A defenceman, Davison played for the San Jose Sharks, New York Islanders, Vancouver Canucks, and New Jersey Devils of the National Hockey League (NHL).

He remained with the Sharks until February 26, 2008, when he was traded to the New York Islanders in exchange for a seventh round draft pick (Jason Demers) in 2008.

On March 18, 2008, in a game against the Toronto Maple Leafs, Davison scored one of the longest goals in NHL history[3] when a shorthanded clearing attempt from around his own goal line took several bounces along the ice before skipping over the glove of goalie and former Sharks teammate Vesa Toskala and into the net for the Islanders' lone tally in a 3–1 loss.

After two seasons abroad in Europe with HC Oceláři Třinec and EC Red Bull Salzburg, Davison returned to the San Jose Sharks, his original draft team, on a one-year, two-way contract on July 7, 2013.

[8] After a two-year stint, and two championships in Salzburg, he left the team at the conclusion of the 2015–16 season and joined the coaching staff of HC Dinamo Minsk of the Kontinental Hockey League (KHL) as an assistant.