Welcome to Hennessy Buick GMC of Southlake in Morrow, GA Hennessy Buick GMC is your Morrow Buick and GMC dealer serving Stockbridge, where shopping for a new or used vehicle is easy and exciting. Here at our dealership, we strive to make your buying experience even more convenient by showcasing an easy-to-use website with all of the tools that you need for your search. Take a look through our online inventory of over 900 new & pre-owned vehicles and discover the Buick or GMC vehicle that’s just right for you!