Douglas "Clay" Cook (born April 20, 1978) is an American songwriter, producer, and musician who is best known as a member of the Zac Brown Band.

The two of them formed the duo known as Lo-Fi Masters, putting 5 of their songs on an eponymous demo tape which was made at Berklee.

Cook moved to California to work in a music shop and later joined The Marshall Tucker Band.

In 2011 Cook announced he had conceptualized his next solo album and planned on working on it throughout the rigorous touring schedule of the Zac Brown Band.

For example, he produced and mixed albums of Atlanta artists Gareth Asher and the Earthlings, as well as a single for the Atlanta-based hard rock band Echoes End, fronted by Kevin Coughlin, a longtime friend and film composer of the Along Came The Devil Horror film series.