Composer, performer, historian, instrument builder, journalist, activist, kayak instructor ­ Bob Ostertag's work cannot easily be summarized or pigeon-holed. He has published 21 CDs of music, two movies, two DVDs, and two books. Electronic instruments of his own design are at the cutting edge of both music and video performance technology. He has performed at music, film, and multi-media festivals around the globe. His radically diverse collaborators include the Kronos Quartet