|Born||Council Bluffs, Iowa, U.S.|
He has made guest appearances in many notable television series including Grey's Anatomy, CSI: Miami, CSI: NY, Without a Trace, The Practice, Crossing Jordan, Star Trek: Enterprise, Star Trek: Voyager, That '70s Show, Nash Bridges, Sliders, Murder, She Wrote, Frasier, Mike & Molly and other series.
He has been a member of the Steppenwolf Theatre Company ensemble since 1979. In December 2007, Guinan co-starred in the Tracy Letts' play August: Osage County which opened on Broadway to critical acclaim.
He also played Master Pakku in the 2010 film, The Last Airbender, as well as appearing in the films Hannibal (2001) and Constantine (2005). He voices Keeper in the video game Star Wars: The Old Republic.
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