|Occupation||Improvisation teacher, writer|
Halpern owned the iO West located in Hollywood, California, where in 1984, with partner Del Close, she began teaching Harold to many students in the Chicago theater community. Many prominent comedians performed at iO West, from Neil Flynn (The Middle) to Jack McBrayer (30 Rock). Also appearing were up and coming comedic minds such as Craig Cackowski (Drunk History). In February 2018 she made the decision to close the theater citing the reasons as the neighboring nightclub and lack of attendance.
She and Close co-authored the book Truth in Comedy: The Manual of Improvisation with editor Kim "Howard" Johnson in 1994. She published Group Improvisation in 2003 and Art by Committee in 2006.
- "iO West Is Shutting Down Next Week". 13 February 2018.
- Obejas, Achy (2001-04-03). "Comedy Guru Charna Halpern Carries On". The Chicago Tribune. Retrieved 2012-01-26.
- Hicks, Margaret (2011). "10 Truth in Comedy". Chicago Comedy: A fairly Serious History. The History Press. Retrieved 2012-01-25.
- Halpern, Charna; Close, Del; Howard, Kim (1994). Truth in Comedy. Meriwether Publishing. ISBN 978-1-56608-003-3.
- Halpern, Charna; Gwinn, Peter (2003). Group Improvisation. Meriwether Publishing. ISBN 978-1-56608-086-6.
- Halpern, Charna (2006). Art by Committee. Meriwether Publishing. ISBN 978-1-56608-112-2.
- Armour, Terry (2006-03-26). "Personals: Who's Who & What's Up". The Chicago Tribune.
- An interview with Charna on Blackout presents: Radio
- An interview with Charna about Del Close on The Poor Choices Show
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