Mitchell's career as a producer began in the mid 1980s as a member of the Kennedy Miller production house based in Sydney.

[7] Following the release of Happy Feet Two in 2011 they were nominated for the 2012 Asia Pacific Screen Award for Best Animated Feature Film.

[8] Mitchell received another Academy Award for Best Picture nomination with George Miller for Mad Max: Fury Road.

Mitchell, Miller, and P. J. Voeten (First Assistant Director) received further nominations for the 2015 Golden Globe Award for Best Motion Picture – Drama and the 2015 Producers Guild of America Award for Best Theatrical Motion Picture.

[citation needed] Producer Co-producer TV movies Miniseries