Painter, printmaker, watercolorist, teacher. San Antonio.
Studied: St. Edwards University, Austin (B.A., Humanities, 1964).
Exhibitions: Baytown Fair, 1953 (prize); Grothues Art Gallery, San Antonio, 1971 (prints); Art Supply Gallery, San Antonio, 1972, 1973, 1974, 1976; San Antonio International Airport Gallery, 1974; Tom Keys Gallery, San Antonio, 1974, 1975; Coppini Academy of Fine Arts, San Antonio, 1975; Art Mart Gallery, San Antonio, 1975; Main Library, San Antonio, 1976 (solo), 1977 (solo); Northern Hills Art Gallery, 1977; Villita Gallery, 1977.
Hamman was a native of Baytown. He was a member of the Brothers of Holy Cross in 1964.