Hans Maass
Hans Maass was a German mathematician who introduced Maass wave forms and Koecher–Maass series and Maass–Selberg relations and who proved most of the Saito–Kurokawa conjecture. Maass was a student of Erich Hecke.
Maaß was primarily concerned with the theory of modular forms, being influenced in particular by Carl Ludwig Siegel, whose Gesammelte Werke he also co-edited with K. S. Chandrasekharan, in addition to Hecke and Hans Petersson - Hecke's assistant at the time, who suggested the topic of his dissertation. He became known for his introduction of non-analytic automorphic forms in the 1940s. Instead of satisfying Laplace's equation, they are eigenfunctions of the invariant Laplace operator; Maaß therefore called them waveforms. Internationally, these forms are known by his name. The motivation for the introduction came in part from Maaß's interest in connections of the theory of modular forms to number theory. Maaß was also concerned with automorphic functions in several variables, Siegel modular functions, and associated zeta functions.