Double bassist, singer, and songwriter who has worked in jazz and popular music. He has performed with Judy Garland, Bucky Pizzarelli, Carly Simon, Frank Sinatra, and Sting. Leonhart is noted for his clever songwriting, often laced with dry humor. His compositions have been recorded by Blossom Dearie, Lee Konitz, and Gary Burton. His poetry is published both in, and outside of, the venue of song.