Frank Huntington Stack (a.k.a. Foolbert Sturgeon) (born 1937 in Houston, Texas) is an American underground cartoonist and fine artist. Working under the name Foolbert Sturgeon to avoid persecution for his work while living in the bible belt, Stack published what is considered by many to be the first underground comic book, The Adventures of Jesus, in 1962.
Stack graduated from the University of Texas in Austin with a BFA in 1959. He was editor of the Texas Ranger student humor magazine from 1958 to 1959. He was also a Professor of Art at the University of Missouri, and did stints teaching at Appalachian State and Virginia Tech. His technique of creating etchings on-site was featured in American Artist magazine.
In addition to publishing several articles in The Comics Journal, he has contributed comics to Zero Zero, Blab!, Snarf, and Rip Off Comix anthologies. In 1972 Stack contributed to The Rip Off Review of Western Culture with "Jesus Goes To The Faculty Party".