Author and biographer Robert Caro appears at the New York Historical Society Museum & Library in New York on Oct. 20, 2021. Caro is still busy working on the presumed last volume of his series on Lyndon Johnson. The book which launched his publishing career, “The Power Broker,” will mark its 50th anniversary in 2024. The New-York Historical Society will host an exhibit in the fall, featuring archival materials it acquired from Caro. (AP Photo/John Minchillo, File)