[3] He then formed a boy band titled Supanova with his friends Harris Hiscoe and Gregor Coleman.
He was then cast in the 2018 tween time travel-dance series Find Me in Paris as Henri Duquet, a role he played for all three seasons.
While filming in Paris, O'Donnell was invited to open for Rufus Wainwright on the French leg of his tour in late 2017.
In 2020, O'Donnell began releasing singles under the name Christy as well as his debut EP Homegrown with MADE Records.
His music has also been compared to Jeff Buckley, Chris Martin, and Bon Iver,[11] as well as Paolo Nutini and Alabama Shakes.