One of the founders of Quinn Emanuel Urquhart & Sullivan’s patent practice, Steven Anderson, has died after a yearslong struggle with lung cancer, the firm said. He was 55.

A statement posted Monday to Quinn Emanuel’s website said Anderson had died on Dec. 27. A Los Angeles-based partner who represented clients such as DirecTV Inc., Anderson joined the firm in 1994 after graduating from Harvard Law School in 1989. He also held an undergraduate degree in information and computer science from the University of California, Irvine.