[2] Aside from acting, Seater has ventured into filmmaking, with the independent feature films People Hold On (2015) and Sadie's Last Days on Earth (2016), which he wrote, directed, and co-produced.
[5][6] Seater voiced the title character in the series Mattimeo: A Tale of Redwall, which aired in 2000, starred as Lucas Randall in the television series Strange Days at Blake Holsey High, which began airing in 2002 and ended in 2006, and had a role in the 2005 film The Prize Winner of Defiance, Ohio, which starred Julianne Moore.
[10] He also played the recurring role of murderer and criminal mastermind James Gillies in the Canadian series Murdoch Mysteries.
[12] In 2015, Seater wrote and directed the feature film People Hold On, which was nominated for a Canadian Screen Award for Best Original Song (by Noah Reid).
[27] He has spoken publicly about the struggles of working in the industry as a child actor, in the wake of the documentary film Quiet on Set in 2024.