At Town & Country she tagged ten top books about Leonard Bernstein, including:
Leonard Bernstein by Humphrey BurtonRead about another entry on the list.
If you're looking for a definitive biography of Leonard Bernstein, look no further than Humphrey Burton's tome, published in 1994. In the 70s, Burton, who worked as BBC's Head of Music and Arts, "developed a second career as a film and television director for Leonard Bernstein’s many musical projects, including documentaries, rehearsals, and over 150 filmed concerts with the Vienna Philharmonic and other orchestras." So not only is he coming at this biography as a writer, but as a collaborator of Bernstein.
--Marshal Zeringue