David Mook was an American song writer and composer. Mook wrote the lyrics to the theme song to Scooby-Doo, Where Are You!, while Ben Raleigh wrote the music. Although not credited the entire time the series aired between 1969-1970, it wasn't until 1998 with the first direct-to-video film, Scooby-Doo on Zombie Island, did they finally receive on-screen credit for the first time. Although they also received credit shortly before that in Scooby-Doo's Snack Tracks: The Ultimate Collection. He died of a long battle to cancer in 1996, at the age of 61.