The German chemist and winegrower Dr. Leonhard Roesler (1839-1910) studied chemistry in Erlangen and Göttingen. From 1867 he worked as a full professor at the Grand Ducal Technical University in Karlsruhe (Baden-Württemberg). Here, it was primarily concerned with wine chemistry issues. During this time he and his colleague Dr. Adolph Blankenhorn (1843-1906) published the "Annals of Oenology". In 1870 he became head of the newly established and - alongside that of Freiherr August-Wilhelm Babo (1827-1894) managed wine-growing school - at that time independent oenochemical experimental station on Klosterneuburg Wine Institute (Lower Austria) entrusted. In 1872 he pointed out the "Weidlinger Spitz" on a Burgundy vine phylloxera to. He actively helped to research and fight the pest.
His son-in-law was Wenzel, who later also worked at the institute Seifert (1862-1942). In his most comprehensive work of comprehensive wine statistics, Roesler published the analyzes of a huge number of wines from all the crown lands of the Habsburg monarchy and the most important European wine countries. Roesler was also a co-founder of the Association for the Protection of Austrian Viticulture in 1884. His colleague Felix von Thümen (1839-1892) described a previously unknown fungus (a vine root mold) in 1877 and called it "Roesleria hypogaea". A memorial stone was unveiled in 1931 in Klosterneuburg in honor of Roesler. A red grape variety created in 1970 in Klosterneuburg was named after him Roesler named.