In 1949, Hamill attended the prestigious Regis High School in Manhattan, but he left school when he was 15 to work as an apprentice sheet metal worker in the Brooklyn Navy Yard; 59 years later, in June 2010, Regis awarded him an honorary diploma.
Hamill attended night classes at the School of Visual Arts (then called the Cartoonists and Illustrators School), with the goal of becoming a painter.
Hamil frequentou as aulas noturnas na Escola de Artes Visuais (chamada então A Escola de Cartunista e Ilustradores), com o objetivo de tornar-se um pintor.
Hamil frequentou as aulas noturnas na Escola de Artes Visuais (chamada então A Escola de Cartunista e Ilustradores), com o objetivo de tornar-se uma pintora.