It will begin performances at the Open Air Theatre, Regent's Park May 16, prior to an official opening May 22 for a run through June 15.
Leonard, who is best known for playing Dr. James Wilson in eight seasons of TV's "House" and for playing Neil Perry in the 1989 film "Dead Poets Society," has also appeared regularly on the New York stage, most recently in the 2011 revival of Born Yesterday. He won the 2001 Tony Award for Best Featured Actor in a Play for Tom Stoppard's The Invention of Love, and was nominated in the same category in 1993 (for Candida) and 2003 (for Long Day's Journey into Night). Other Broadway appearances include Brighton Beach Memoirs, Breaking the Code, The Speed of Darkness, Philadelphia Here I Come!, Arcadia, The Iceman Cometh, The Music Man and The Violet Hour.
Leonard has also appeared extensively Off-Broadway, including productions of Fifth of July, You Never Can Tell, Pygmalion, King Lear and When She Danced. Other film crfdits include "Much Ado About Nothing," "The Age of Innocence," "Mr. & Mrs. Bridge," "Swing Kids," "Tape," "Chelsea Walls" and "The Last Days of Disco."
To Kill A Mockingbird will be directed by the Open Air's artistic director Timothy Sheader, with designs by Jon Bauser. Harper Lee's novel has been adapted for the stage by Christopher Sergel.
To book tickets, contact the box office on 0844 826 4242, or visit www.openairtheatre.com for more details.