Thornton Dial, a pioneering American artist, left an indelible mark on the art world with his expressive and monumental works. Born on Sept. 10, 1928, in Emelle, Alabama, Dial's artistic journey began in the late 1980s when he gained prominence for his assemblages of found materials, executed on a grand scale. | By Tamara Shiloh Thornton Dial, a pioneering American artist, left an indelible mark on the art world with his expressive and monumental works. Born on Sept. 10, 1928, in Emelle, Alabama, Dial's artistic journey began in the late 1980s when he gained prominence for his assemblages of found materials, executed on a grand scale.