William Petersen has a distinguished background in film, theater and television. His television credits include the films "Long Gone," "The Rat Pack," "The Kennedys of Massachusetts," which won a Golden Globe Award, and "The Beast." He also serves as executive producer of "CSI: Crime Scene Investigation" and was nominated in 2003 for a Golden Globe Award for his portrayal of lead investigator Gil Grissom.

His feature film credits include "To Live and Die in L.A., "Manhunter," "Cousins," "Young Guns II," "Fear," "Hard Promises," which he also produced, and "The Contender."

Petersen made his Broadway debut in a revival of Tennessee Williams' "The Night of The Iguana." In 1979 he founded the Remains Theater Ensemble in Chicago with a group of fellow actors. He has appeared in a number of regional stage productions including "A Streetcar Named Desire," "The Time of Your Life," "Glengarry Glen Ross," "Fool for Love" and "Speed-the-Plow." After nine seasons, Petersen decided to leave CSI in 2009 to resume his career as a theater actor.

However, he reprised his role of Gil Grissom in the eleventh season episode "The Two Mrs. Grissoms," which aired February 3, 2011, and remains a producer.

On February 3, 2009, Petersen was honored with a star on the Hollywood Walk of Fame.

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