Taken from the above linked article, published in 2016:
Every year, about 275,000 people tour the Jack Daniel’s distillery in Lynchburg, and as they stroll through its brick buildings nestled in a tree-shaded hollow, they hear a story like this: In the 1850s, when Daniel was a boy, he went to work for a preacher, grocer and distiller named Dan Call. The preacher was a busy man, and when he saw promise in young Jack, he taught him how to run his whiskey still — and the rest is history.
This year is the 150th (sic) anniversary of Jack Daniel’s, and the distillery, home to one of the world’s best-selling whiskeys, is using the occasion to tell a different, more complicated tale. Daniel, the company now says, didn’t learn distilling from Dan Call, but from a man named Nearis Green, one of Call’s slaves.