Rocky Top Engineering. That's all this Ga Bulldog can say. The instructions are a very simple, elementary school-like drawing and they included 2 bolts that are too short. That being said, the swing is beautiful and great craftsmanship. Easy to find the correct length screws at the local Lowes. Also, the odd square head screws are a bit of a pain, but I would buy the swing again. Can't get better than Made in the USA(even if it is Tennessee). HAHA! And the little tricks made my assembly entertaining;)