Frank John Forelli, Jr. (8 April 1932, San Diego – 5 September 1994, Madison, Wisconsin) was an American mathematician, specializing in the functional analysis of holomorphic functions.
[1] He received there in 1961 his Ph.D. under Henry Helson with thesis Marcel Riesz's theorem on conjugate functions.
[2] In 1961 Forelli joined the faculty of the University of Wisconsin–Madison, where he remained for the remainder of his life.
[1] The main focus of his research was in the properties of holomorphic functions.
In particular, he used Hilbert space methods applied to the boundary values of such functions.