Joseph David Keery (born April 24, 1992) is an American actor and musician. He is best known for playing Steve Harrington in the science fiction series Stranger Things (2016–present) and for his role in the comedy film Free Guy (2021). Keery releases music under the stage name Djo. He is a former member of the psychedelic rock band Post Animal.

Early life
Keery was born in Newburyport, Massachusetts. His father is an architect and his mother is an English professor. He is the second of five children.

Keery was raised in Newburyport and attended River Valley Charter School, a local Montessori elementary and middle school, and Newburyport High School. When he was young, he participated in Theater in the Open, a performing arts camp at Maudslay State Park, but ultimately began acting in high school, initially performing there at his older sister's insistence.

Keery went on to study at The Theatre School at DePaul University and graduated in 2014 with a Bachelor of Fine Arts in Acting.