Timothy O'Donnell commenced his dance training at his mother's ballet school at age seven. In 2001, he joined The Australian Ballet School, where he received several awards, including the Jacob Bloch Memorial Award and first place in The Australian Institute of Classical Dance’s national choreographic competition. After graduating in 2004, he joined West Australian Ballet. While with the Company, he performed multiple principal and soloist roles in ballets such as Coppèlia, Cinderella, The Red Shoes, The Nutcracker and Romeo & Juliet. O'Donnell has also worked closely with many celebrated international artists, such as Paul Lightfoot, Petr Zuska, Simon Dow, Matjash Morzewski and Ivan Cavallari. In 2007, he won the "Outstanding Performance by a Male Dancer" award at the West Australian Dance Awards. O'Donnell continued to choreograph while dancing at West Australian Ballet. In 2009, he entered Milwaukee Ballet's International Choreographic Competition, Genesis, where he was awarded first place and the Audience Choice Award for his work, The Games We Play. He returned to Milwaukee Ballet in 2010 to create another new work, Boléro-Let There Be Light. That same year, he became a co-director of Ludwig, an Australian dance company, where he worked for major dance events, including the Australian Dance Awards, and appeared as a choreographer on "So You Think You Can Dance-Australia." Since joining Milwaukee Ballet Company in 2012, O'Donnell has appeared as Marcello in La Bohème and staged his world premiere of Children of the Wall.