Collectively, alumni have won at least 20 Academy Awards. Gregory Peck (BA 1939), nominated for four Oscars during his career, won an Oscar for acting in "To Kill a Mockingbird". Chris Innis (BA 1991) won the 2010 Oscar for film editing for her work on best picture winner, "The Hurt Locker". Walter Plunkett (BA 1923) won an Oscar for costume design (for "An American in Paris"). Freida Lee Mock (BA 1961) and Charles H. Ferguson (BA 1978) have each won an Oscar for documentary filmmaking. Mark Berger (BA 1964) has won four Oscars for sound mixing and is an adjunct professor at UC Berkeley. Edith Head (BA 1918), who was nominated for 34 Oscars during her career, won eight Oscars for costume design. Joe Letteri (BA 1981) has won four Oscars for Best Visual Effects in the James Cameron film "Avatar" and the Peter Jackson films "King Kong", ', and "".