Charlie plays Peter Mills.
Barnett was raised on a sailboat in Florida until he was seven. His mother is Swedish and a former Mormon, and his father is a boatbuilder from Minnesota. He discovered theater when he was six years old, and performed in many operas and musicals.Barnett is a graduate from Booker High School. He participated in the Carnegie Mellon Musical Theater Summer Program.
Barnett is a graduate of the Juilliard School drama program, class of 2010. He enjoys sailing and classic cars. While pursuing his career, Barnett has lived in New York City, Los Angeles, and Chicago. During filming for Chicago Fire, Barnett lived with co-stars Joe Minoso and Yuri Sardarov. He is a White Sox and Chicago Bears fan.