Dorman moved to the United States to attend Boston University, where he was a standout for the school's college soccer team.

[1] Dorman made his debut for New England, coming on for Daouda Kanté, in a 3–1 loss against San Jose Earthquakes on 17 April 2004.

[2] In his first season with the Revs, Dorman clocked only 365 minutes, but scored two goals and an assist in that time,[2] evincing an attacking flair.

[3] Dorman appeared in all three of the Revolution's 2004 MLS Cup Playoff matches, and provided a game-winning assist on 31 October in the Eastern Conference Semifinal against the Columbus Crew.

[3] The 2006 season was a break-out year for Dorman,[4] as he played in all 32 games for the Revs (starting all 32), scoring six goals and recording a career-high ten assists.

[5] During a season when many Revolution players missed time due to injury, suspension, or international duty, Dorman was forced to play many roles and positions.

[4] His diligence and creativity on the attack gained the attention and respect of many around the league, and he was named the 2006 "Man of the Year" by the Midnight Riders, the Revolution's independent supporters group.

[16] Shortly after the transfer headlines, Dorman suffered a hamstring injury, ruling him out for six weeks after coming off in the first half in a 3–1 loss against Celtic.

Dorman finished the season as St Mirren's league top scorer, with Billy Mehmet with 12 goals each in all appearances.

[21] After his contract at St Mirren expired, Dorman made the move to England to join Championship side Crystal Palace.

[25] His second season in south London saw him limited to appearances for Palace's reserve team, and so Dorman made the move to League Two side Bristol Rovers on a loan deal in November 2011.

After his loan spell at Bristol Rovers, Dorman did not rule out returning to the club after clarifying his future with Crystal Palace.

[2] Dorman received two straight red cards during the 2013 campaign,[35] on 10 August against Sporting Kansas City, and on 5 October against the Red Bulls,[36] He started both of the Revolution's playoff matches against Sporting Kansas City in the Eastern Conference Semifinals, scoring in the 55th minute of the first match to give the Revolution a 1-0 lead.

[2][37] Dorman managed to make 16 appearances in the 2014 New England Revolution season despite being sidelined with an MCL injury on 15 July which kept him out of the team until 12 September.

[2] He also made 3 appearances in the Revolution's 2014 playoff run, which ultimately culminated in a loss to the LA Galaxy in the 2014 MLS Cup Final.