Born in New York City. Attended Polytechnic Institute of Brooklyn. Married to Beatrice. Employed with the United Parcel Service.

He sold currency under his own name in 1976. Employed as cataloger for Lester Merkin, NASCA in 1979, Herbert I. Melnick, and Stack's.

Gengerke was a specialist in paper money. Compiler of American Numismatic Auctions. 125 copies of the 8th edition were published in 1990. One hundred were GBC bound and 25 were hardbound with additional pages listing consignors. Author of U. S. Paper Money Records. 100 copies were published. Editor of The Asylum after 1995 to 1996.

Gengerke collected fractional currency and credit cards. He claimed to have the only complete collection of regular issue fractional currency ever formed. This was sold at auction by Currency Auctions of America on January 6-7, 1995.

bio by correspondence, 1991; profile: NN:WW 9/11/2001