During her previous run as artistic director, she helmed productions of Cascabel and Hard Times.
The Tribune reported that Stillman was selected via a triennial vote between the theatre's board of directors and ensemble members. She replaces Andrew White, who has served at the helm since 2010 and will take on the position of connectivity and engagement director.
The theatre is currently staging a theatrical adaptation of Treasure Island through Jan. 31. To purchase tickets and for more information, visit LookingGlasstheatre.org. The theatre is located at 821 N. Michigan Ave., Chicago.