DreamWorks

operating chief Helene Hahn will step down, the movie studio said Thursday.

The company, whose animation unit earlier this year filed to go public, said Hahn first worked with principal partner Jeffrey Katzenberg 27 years ago at Paramount. She had worked for the company since it was started 10 years ago following Katzenberg's departure from rival

Disney

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.

"There are literally no words that could adequately convey how much I will miss Helene both professionally and personally," Katzenberg said. "For almost 30 years, she has quite simply been a treasured and trusted colleague and friend. She was there when DreamWorks was still only a dream, and I can honestly say we couldn't have done it without her."

Since her marriage in 1999, Hahn has maintained her primary residence in Utah and has been commuting to and from DreamWorks. She has agreed to continue as COO until a replacement is in place.