High Quality Content by WIKIPEDIA articles! Erich von Tschermak-Seysenegg (15 November 1871 – 11 October 1962) was an Austrian agronomist who developed several new disease-resistant crops, including wheat-rye and oat hybrids. He was a son of the Moravia-born mineralogist Gustav Tschermak von Seysenegg. His maternal grandfather was the famous botanist, Eduard Fenzl, who taught Gregor Mendel botany during his student days in Vienna.