An Ottawa native, Dorion spent the previous two-plus seasons as one of two assistant general managers with the Senators after being promoted to the role on Jan. 13, 2014. Prior to his being named assistant general manager, he spent four-plus seasons as the team's director of player personnel. He also served two seasons as the Senators' chief amateur scout after originally being hired by the club in July, 2007.

In addition to his primary function of leading the day-to-day hockey operations' component of the club, Dorion is also responsible for overseeing the Senators scouting staff, both professional and amateur, while managing all facets of evaluation for players both inside and outside of the organization, across all levels of hockey. He also remains responsible for contract negotiation for NHL and AHL restricted and unrestricted free agents.

The 2018-19 season will serve as Dorion's 25th consecutive in the NHL after also spending two seasons as an amateur scout for the New York Rangers and 11 seasons as an amateur scouting coordinator and as chief scout with the Montreal Canadiens following his hiring by the club in 1994.

Pierre lives in Orleans and has two children, a daughter, Vanessa and a son, Antoine.