He has been a member of Rugby Australia's match officials panel since 2015, having previously refereed in Western Australia and worked in development for Rugby WA. In 2017, he was selected to officiate the 2017 Women's Rugby World Cup. In 2020, following the COVID-19 pandemic causing the cancellation of the 2020 Super Rugby season and regional tournaments being created in its place, Cooper made his Super Rugby refereeing debut, having previously only been an assistant in Super Rugby, in the match between the and on 7 August 2020 in the 2020 Super Rugby AU competition. He was appointed to the officiating list for the 2021 Super Rugby AU season in February 2021.