Proof is a 2000 play by the American playwright David Auburn. Proof was developed at George Street Playhouse in New Brunswick, New Jersey, during the 1999 Next Stage Series of new plays. The play premiered Off-Broadway in May 2000 and transferred to Broadway in October 2000. The play won the 2001 Pulitzer Prize for Drama and the Tony Award for Best Play.

The Walter Kerr Theatre, previously the Ritz Theatre, is a Broadway theater at 219 West 48th Street in the Theater District of Midtown Manhattan in New York City. The theater was designed by Herbert J. Krapp and was constructed for the Shubert brothers in 1921. The venue, renamed in 1990 after theatrical critic Walter Kerr, has 975 seats across three levels and is operated by Jujamcyn Theaters. The facade is plainly designed and is made of patterned brick. The auditorium contains Adam-style detailing, two balconies, and murals.