[citation needed] Johnsen re-joined Warner Bros. in 1997 as a creative executive and worked on such films as Three Kings, The Perfect Storm and Analyze This.
As an executive, she was noted for recommending the first Harry Potter book for a potential film series, which became one of the studio's most successful franchises of all time.
[3] As a senior executive, she oversaw the Harry Potter films, Blood Diamond, I Am Legend, the Scooby-Doo series, and Superman Returns, among others.
In 2013, Johnsen launched mytruestory.com, a website in which writers could share their true stories and Hollywood producers could read them in consideration for potential projects.
[7] Johnsen recently served as a panelist at the Shanghai Film Festival and also sits on the USC School of Cinematic Arts Alumni Board.