Tom Stoppard did something no writer had ever done before: He wrote his masterpiece at the age of 82, after having written other masterpieces that would have been the capstones of any other writer’s career in his thirties, his forties, his fifties, and his sixties. That masterpiece was Leopoldstadt, and it was first staged in January 2020—45 years after the initial production of his first unambiguously great work, the astoundingly inventive and thrillingly alive farce called Travesties. It had come to the stage eight years after Stoppard had stunned the theatrical world at the age of 29 with Rosencrantz and...