John Sanford Gilliland Jr. (October 18, 1935 – July 27, 1998) was an American radio broadcaster and documentarian best known for the Pop Chronicles music documentaries and as one of the original members of The Credibility Gap.

[1] While attending Texas Christian University, he worked as a disc jockey at KCUL in Fort Worth.

[7] Fellow founding member Richard Beebe said of him that Even though John was an integral part of the "Gap," working on the Pop Chronicles was always number one for him.

[13] In response to market research showing that most of its daytime audience preferred watching television at night, KSFO hired Gilliland in 1971 to host a five-hour variety block of music and entertainment evenings from 7 p.m. to midnight; Gilliland would continue as host until 1978.

[21][22] During his retirement he hosted a late night show on KREB in Houston[23] and did some work for KIXC in Quanah.