There are two books listed for Shepard and Shepherd on Rick Pierpoint's Family Genealogy page.
These did not help, but they led me to the HathiTrust. There I searched for Zebidiah Shiperd and I found the following:
SHIPHERD, ZebulonRudd, a Representative from New
York; born in Granville, Washington County, N. Y., November
15, 1768; completed preparatory studies; studied law; was ad-
mitted to the bar and commenced the practice of his profession
in Granville, N. Y., was elected as a Federalist to the Thirteenth
Congress (March 4, 1813-March 3, 1815); resumed the practice
of his profession in Granville; trustee of Middlebury College,
Middlebury, Vt., 1819–1841; moved to Moriah, Essex County,
about 1830, where he died November 1, 1841; interment in the
Moriah Corners Cemetery. See: https://hdl.handle.net/2027/umn.31951000487691l?urlappend=%3Bseq=1608
United States. Congress. (1961). Biographical directory of the American Congress, 1774-1961: the Continental Congress, September 5, 1774, to October 21, 1788 and the Congress of the United States, from the First to the Eighty-sixth Congress, March 4, 1789, to January 3, 1961, inclusive. [Rev. ed. Washington]: U.S. Govt. Print. Off.