Career
During his tenure he revised the statutes for the education of priests in Fulda. Pfaff was ordained as priest on 19 September 1798. On 15 November 1831 he was appointed bishop of Fulda.
He was confirmed on 24 February 1832, and ordained on 2 September 1832 by the bishop of Würzburg, Adam Friedrich Groß zu Trockau.