Home › Authors › Wolfgang Haack Wolfgang Haack Germany · b. 1902 – d. 1994 · 2 books Biography Wolfgang Siegfried Haack was a German mathematician and aerodynamicist. He in 1941 and William Sears in 1947 independently discovered the Sears–Haack body. Books by Wolfgang Haack Vorlesungen über partielle und Pfaffsche Differentialgleichungen 1969 Elementare Differenzialgeometr Elementare Differenzialgeometrie 1955