Stern began his career by writing the screenplay for Mr. Popper's Penguins in 2011.
[4] In the same year, he wrote a script based on the Disney theme park attraction It's a Small World.
[10] In 2019, he created the animated series Green Eggs and Ham, based on the Dr. Seuss book of the same name.
[11] In 2020, he signed on to produce the Warner Animation Group film Toto,[12] before he was replaced by Derek Frey in 2021.
[14] He teamed up with Robert Zemeckis to write the HBO Max streaming series Tooned Out.