“A musicologist and record producer best known for influential, lucidly written biographies of Beethoven and Mozart as well as a hotly debated scholarly article on Schubert’s sexuality,” he was, as Donal Henahan once put it in a review, “one of the most persuasive voices on behalf of the perilous intellectual voyage known as psychobiography — or, less kindly, ‘psychobabblography’.” – The New York Times