Mark Reeds enters his second season as an assistant coach with the Senators after being named to the position on June 23, 2011. He spent the previous four seasons as head coach of the OHL's Owen Sound Attack, where he compiled a regular-season record of 46-17-5 en route to the Western Conference title and eventual OHL championship in his most recent campaign with the club in 2010-11.

A Toronto native, Reeds was recognized with the Matt Leyden Trophy as the 2010-11 OHL coach of the year as selected by OHL coaches and general managers. He led Owen Sound to the OHL playoffs in two of his four seasons behind the Attack bench, while his team posted a 119-118-35 record over 272 regular season games.

Prior to joining Owen Sound, Reeds spent four seasons as head coach of the United Hockey League's Kalamazoo Wings. In his time with Kalamazoo, including the 2005-06 campaign when the Wings won the Colonial Cup as league champion, Reeds compiled a record of 194-86-28 over 308 regular-season games. Before his arrival in Kalamazoo, Reeds led the UHL's Missouri River Otters for four seasons where he compiled a record of 159-105-34 in 298 games. He is a three-time recipient of the UHL's coach-of-the-year award (2003, 2005 and 2006).

Reeds began his coaching career with the ECHL's Peoria Rivermen prior to the 1996-97 campaign and spent three seasons with the club, compiling a 126-65-19 record in 210 games.

Drafted by the St. Louis Blues in the fifth round, 86th overall, of the 1979 NHL Entry Draft, Reeds played in 365 NHL contests, registering 159 points (45 goals, 114 assists) with the Blues and the Hartford Whalers between 1981-89.

Reeds and his wife Mary spend their off-season in St. Louis and have two children, Kyle and Kelsey.