Wishner's work to improve Greek-Jewish relations led him to receive the Frizis Award from the Hellenic American Leadership Conference.
"He devoted his time to creating understanding between ethnic, racial and religious groups," said Jonathan Levine, the former assistant national director for AJC.
Through his various leadership roles, Wishner met the presidents of the U.S. and several other countries, as well as Nelson Mandela after the South African leader was released from prison.
The meeting "was one point in his life where he truly felt he was representing the Jewish people," said daughter Mimi Wishner Segel.
He was an attorney with the firm of Cole, Wishner, Epstein & Manilow before joining Walter E. Heller & Co., a finance company, where he eventually served as president and chief operating officer.