His work focused on the Eurasian context of Tibetan culture, the Bön religion, the Zhangzhung language, and the Gesar epic.
He studied theology, philosophy, psychology and history of art at the universities of Tübingen, Rostock,[1] Leipzig and Munich between 1932 and 1938.
After leaving the museum in 1955, Hummel worked as a pastor in the country parish of Plohn in Vogtland until his retirement.
mongolischen Völkerschaften' in einer Ausgabe durch Johann Heinrich Merck," Zentralasiatische Studien ·10: 545-550.
1988 Etruskischen als Beitrag zur linguistischen Neolith-Anthropologie Eurasiosaharaniens," Gegenb morph jb 134, 1: 53-57.