He is best known as Grady Mitchell in the Disney Channel Original Series, Sonny with a Chance and So Random!. Doug has an older brother, Chris Brochu, who is notable for his role as Ray Beech in the Disney Channel Original Movie Lemonade Mouth. Brochu has appeared in stage productions of My Fair Lady, Smokey Mountain Christmas, The Play"s the Thing and Forever Broadway.
He has also had guest starring roles on Nickelodeon"s Zoey 101 and iCarly.
Brochu played the main role as Grady Mitchell in Sonny with a Chance and in So Random!. Brochu also played in a special guest role as Oogie in the Disney XD"s Pair of Kings.
In 2011, Brochu was part of Disney"s Friends for Change Games, which aired on Disney Channel.