Chicago’s iO Theater, which specializes in long-form improv, marks its 45th anniversary with a three-day celebration called IO45 from November 5 to 7. Founded in 1981 by Charna Halpern and David Shepherd, iO began as the ImprovOlympic, focusing on team-based comedy competitions. This changed when Halpern partnered with improv expert Del Close, concentrating on storytelling-based improv, notably the ‘Harold’ technique. This form connects different scenes into a cohesive narrative throughout a performance.
Brad Pike, iO’s creative director, highlights the evolution of improv over 45 years as a core aspect of IO45. Pike, a member of the long-running Harold team Devil’s Daughter, notes significant community growth beyond the theater’s earlier reputation as a ‘boys’ club.’ Now, iO’s diverse performances represent various backgrounds, making improv accessible and inclusive, with different voices intertwining in each show.
IO45 will celebrate both veteran performers and new talents who advance long-form improv. Unlike previous anniversary events, which featured stage-to-screen alumni, this festival focuses on the current performers who maintain iO’s spirit on Kingsbury Street. Featured acts include Improvised Jane Austen, Escándalo, and Stir Friday Night, showcasing diverse comedic traditions.
Stir Friday Night, an Asian American comedy troupe with notable alumni like Danny Pudi, has played a vital role at iO. They have consistently featured in festivals and will host an AAPI-focused improv jam monthly. Executive Artistic Director Jonathan Lee-Rey emphasizes the importance of creating a community for AAPI performers to connect and collaborate.
In improv, audience interaction sets it apart from scripted sketch shows, creating art spontaneously. Pike believes that in an era where people are tired of artificial experiences, improv offers genuine, human-made art communicated live. Notable performances at IO45 include The Scene with T.J. Jagodowski and a stand-up show by Maggie Winters. A panel with Halpern discussing the theater’s history is also scheduled.
Pike stresses that iO’s strength lies in its community of performers. The theater depends on these artists; their involvement is irreplaceable. As improv is unscripted, each performance is unique, driven by the talent involved.
Ryan P. C. Trimble contributed as a freelance writer. For those interested in attending, IO45 occurs from November 5-7 at iO Theater, 1501 N. Kingsbury St., with tickets and details available at ioimprov.com/io45.

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