Born April 6, 1985 in Lloydminster, Alberta, Clarke MacArthur has played in the NHL with the Buffalo Sabres, Atlanta Thrashers and the Toronto Maple Leafs before joining the Ottawa Senators.

His junior years were spent in his home province of Alberta where he played with the Drayton Valley Thunder of the Alberta Junior Hockey League. He later joined the Medicine Hat Tigers of the WHL where he notched 75 points as a rookie with the Tigers in the 2002-03 season. In his second year with the Tigers, he helped lead the team to a Memorial Cup berth. Despite a loss in the semi-finals, MacArthur finished fourth in scoring and was named to the Memorial Cup All-Star Team.

After a season with the Rochester Americans of the AHL,  MacArthur was called  up to the Sabres and made his NHL debut on December 19, 2006 against the Montreal Canadiens. He logged his first NHL point on February 20, 2007 against the Philadelphia Flyers and scored his first goal against the Ottawa Senators on February 22, 2007.

An established player with over 400 NHL games to his credit, Clarke MacArthur has veteran credentials that will surely help the Ottawa Senators.