His best offensive season was with the Pittsburgh Penguins in 2003–04, after coming over from the Toronto Maple Leafs; he scored 7 goals and 24 points in 25 games.

Jackman was traded from the Florida Panthers to the Anaheim Ducks on January 3, 2007, for a conditional pick in the 2007 NHL Entry Draft.

After parts of five seasons in the NHL, Jackman opted to sign overseas with EC Red Bull Salzburg in Austria in the summer of 2007.

In 2010, he accepted a special invitation to play for the Utah Grizzlies (ECHL) prior to joining HC Slovan Bratislava in Slovak Extraliga.

On August 26, 2014, the Nippon Paper Cranes, a Japanese team playing in the Asia League Ice Hockey, announced that they had signed Jackman to a one-year contract.

In June 2017, Jackman was appointed head coach of the Bradford Rattlers of the Greater Metro Junior A Hockey League.