Become a Certified Bourbon Steward in the Bourbon Capital of the World! The Stave and Thief Society’s 2 1/2 to 3-hour Certified Bourbon Steward class at Preservation Distillery is for bourbon enthusiasts from all walks of life. This in-depth program is designed so that once you’re a Bourbon Steward, you’ll be able to discuss America’s native spirit confidently and accurately and make recommendations to friends, family, and others based on their individual tastes and preferences.