Tour guide Ron Craig points to a photo in Jack Daniel's old office at the whiskey maker's distillery in Lynchburg, Tenn. The photo, taken in the 1890s, shows Jack Daniel (wearing a black-banded white hat and a gray goatee), seated next to an African-American man. He and a second African-American man (top left) are believed to be sons of Nearis Green, who may have helped teach Daniel his trade.