A spokesperson for the production confirmed the casting to Playbill On-Line. Keith Reddin's Frame 312, directed by Karen Kohlhaas, begins performances Nov. 26. The play concerns a young secretary who was asked to keep an important secret at the time President John F. Kennedy was assassinated.

"More than thirty years later," the Atlantic website explains, "she decides it is time to come clean with her family about her relationships to history, and how hiding from her past has taken a personal toll. Not all stories have willing listeners, however, and Lynette is faced with wondering if some secret should simply be kept."

An Obie Award-winning actress, Mary Beth Peil is a member of the Atlantic Theater Company and the Drama Dept. She received a Tony nomination for her performance in the 1985 production of The King and I, and she has appeared in plays by Paul Rudnick, A.R. Gurney, Craig Lucas and Edward Albee. Peil's screen credits include "The Odd Couple II," "Law & Order," "The Job" and currently "Dawson’s Creek."

The Atlantic Theater is currently presenting Jez Butterworth's The Night Heron through Nov. 9. Additional casting for Frame 312 is expected shortly.

The Atlantic Theater Company is located in Manhattan at 336 West 20th Street. Tickets are priced at $45; call (212) 239-6200 or visit www.atlantictheater.org.