Since playing the sinister M.C. in Bob Fosse's "Cabaret," Joel Grey has kept busy: he acts, directs (currently a production of "On Borrowed Time," the play in which he made his theatrical debut at age 9) and takes photographs, a hobby that has yielded four books and work in the Whitney's permanent collection. His latest series - enigmatic images of peeling, weather-worn billboards - will be published in a Sam Shahid-designed monograph next month, and can be seen at Steven Kasher Gallery in New York. The twist? The photos were shot with an iPhone 5, demonstrating that Grey, 81, is quite adept at changing with the times. "The Billboard Papers," Pointed Leaf Press, $95; exhibition runs through Oct. 19; stevenkasher.com.