per Stephen Hawking; David Filkin; Philip Martin, (Television director); William Grant; Frank Langella; Martin Sage, (Film editor); Scott McEwing; Neela Sarkar; Jeff Baynes; Piers Lello; Cynthia Millar, (Ondes Martenot player); WNET (Television station : New York, N.Y.); Uden Associates.; David Filkin Enterprises.; British Broadcasting Corporation. Television Service.; Educational Broadcasting Corporation.; PBS Home Video.;