Theater 2015-16: Steppenwolf 40th anniversary boasts premieres by Frank Galati, Tracy Letts

13th in a series of season previews: Two world premieres and three first-time Chicago stagings form a doubly celebratory season at Steppenwolf Theatre – marking the company’s 40th anniversary and honoring the legacy of its longtime artistic director, Martha Lavey, who stepped down at the end of last season. Steppenwolf opens with the world premiere of Frank Galati’s adaptation of “East of Eden,” John Steinbeck’s sweeping, tumultuous epic novel about family dynamics and fortunes set mainly in California early in the 20th century.