March 15, 1679, Pfullingen, Württemberg, Germany.
October 12, 1707, probably at Schwarzenau (near Bad Berleberg), Germany.
After studying at the University of Tübingen, where he graduated in 1697 and became lecturer in 1700, Gmelin was in 1705 appointed assistant pastor in Herrenberg.
There he associated himself with the Separatists; denounced the Church as worldly and as requiring a mere outward profession; objected to infant baptism, and departed from the view of the Church on the intermediate state, the millennial reign, and on the reconciliation of all things. For these teachings he was deposed in 1706.
After living for a while in Dörtenbach, near Calw, he retired to Wittgenstein, and finally to Schwarzenau.