Cullen first voiced Optimus Prime in 1984 and later returned for the live-action Transformers films beginning in 2007. His calm, powerful delivery helped make the character a symbol of courage, leadership, and compassion.
He also voiced Eeyore, KARR in Knight Rider, and contributed memorable creature sounds to Predator. Over his long career, Cullen performed roughly 100 different characters across television, movies, animation, and video games.
His family asked fans to honor him through compassion, integrity, loyalty, and service to others. The phrase closely connected to both Cullen and Optimus Prime remains: “Be strong enough to be gentle.”
