Rosenman has conducted the Los Angeles Philharmonic, London Symphony, Orchestra of RAI, Santa Cecelia Orchestra and Los Angeles Chamber Orchestra. He has taught and been a guest lecturer at the University of Southern California, California Institute of the Arts, University of Illinois, University of California at Berkeley, UCLA, University of Massachusettes, Mount Holyoke College, Smith College, Claremont College, Harvard University, New School in New York and Yale University.
Awarded an honorary Doctorate of Philosophy by John F Kennedy University, Orinda, CA
On why James Dean picked him as a piano teacher: "I think what he really wanted was to get close to me. For some reason he just admired me enormously. He treated me almost like I was his father, even though I was only a few years older than he was. I remember one time he said, 'Let's go out and play some basketball.' I said, 'I'm writing.' He kept saying, 'Let's go out and play basketball.' I asked him why he wanted me to play basketball with him so badly. He said, 'You know, it's like when you really want your father to play ball with you.' I said. 'I'm not your father. Your father is still alive. Why don't you call your father?' If I read a book on philosophy, he'd carry the book around and make people believe he was reading it. It was sweet, because at the time all the admiration he was getting from the public was for the things he didn't like about himself. He really wanted to be an intellectual." --Leonard Rosenman to Time Out New York, May 8-15, 1997.
