He published a ground-breaking paper in 1958 that established him as a pioneer in the representation theory of reducible p-adic groups.Mautner Spherical functions over p-adic fields. I, Amer. J. Math. 80 (1958), 441–457; Part 2 appeared 6 years later in Amer. J. Math., vol. 86, 1964, S. 171-200
