Senjem, a Minnesota native, began his professional career with the St. Paul Saints in 1997. Before arriving in Brockton in 2005, he spent time in the Cincinnati Reds and Colorado Rockies organizations. He set an early tone for a successful 2006 campaign with a game-winning solo home run in the 10th inning on Opening Night at Campanelli Stadium. He went on to tie the franchise mark for home runs in a single season with 14, and led the team in home runs, and runs batted in. Twice, the left-handed hitter was named the Can-Am League’s Batter of the Week. In addition, he was named to the League's post-season All-Star team.