Petersen is an official ensemble member at the Steppenwolf Theater Company in Chicago. His credits with the company include Dublin Carol, Balm in Gilead and Fool for Love. Other theater credits include In The Belly of the Beast, The Night of the Iguana, A Streetcar Named Desire, and Glengarry Glen Ross. He is best known for his role as Gil Grissom on CBS-TV's CSI.
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