Bernard Gersten, a longtime leader in the nonprofit theater world, will step down next year as exec producer of Lincoln Center Theater, where he’s held the post for 27 years.

He’ll exit June 30, following the conclusion of the company’s 2012-13 season. The theater board has already decided he won’t be replaced, with the theater continuing to be run by a.d. Andre Bishop and its current team of staffers, including managing director Adam Siegel.

Gersten has played pivotal leadership roles at two of New York’s major nonprofit theaters. He was Joseph Papp’s deputy in the early years of the Public Theater, serving as associate producer from 1960 to 1978, a tenure that included the preems of titles including “A Chorus Line” and “Hair.” He was tapped as exec producer of LCT in 1985.

Gersten’s long career with the company has encompassed productions including the “Six Degrees of Separation,” “The Coast of Utopia,” “Arcadia” and “The Sisters Rosensweig,” among many others. He worked alongside a.d. Gregory Mosher from the beginning of his tenure until 1991, when current a.d. Andre Bishop stepped into the post.

Bishop, Siegel and other LCT execs, including exec director of development and planning Hattie K. Jutagir and finance director David S. Brown, will shoulder Gersten’s duties when he exits.

In the meantime, Gersten will stick with LCT for an upcoming 2012-13 slate that includes Christopher Durang’s “Vanya and Sonia and Masha and Spike,” starring Sigourney Weaver and David Hyde Pierce, and a Bartlett Sher-helmed revival of Clifford Odets’ “Golden Boy.”