“Stefan Brecht, whose father was the playwright Bertolt Brecht and who added to the family’s theatrical legacy by fastidiously chronicling the rise of avant-garde theater, died on April 13 in Manhattan. … For decades, Mr. Brecht worked on a series of books, collectively known as ‘The Original Theater of the City of New York: From the Mid-Sixties to the Mid-Seventies,’ that described, in great detail, the work of the city’s seminal experimental theater artists.”