 He has also designed sets for opera (including eight productions for the Metropolitan Opera and thirteen for the New York City Opera, ballet, and regional theatres such as Arena Stage, the Mark Taper Forum, and the Guthrie Theater.He designed over 30 productions for Joseph Papp at The Public Theater, including the original Off-Broadway production of Hair (musical).Since 1969, Lee has taught at the Yale School of Drama, where he is currently co-chair of the Design Department.