Owners and executives Samuel Gary and Ron Williams have brought their energy to Gary-Williams Energy for many years. The independent oil and gas company that shares their names has operations primarily in the Rocky Mountain, Midcontinent, and Gulf Coast regions. Its subsidiaries, Wynnewood Refining Company and Gary-Williams Production Company, are engaged in exploration, production, refining, and marketing. Gary-Williams Energy 's primary asset is its 70,000 barrels-per-day crude oil refinery in Wynnewood, Oklahoma, which produces a range of products including asphalt, aviation fuel, gasoline, and natural gas liquids (NGLs). The company also has a property business, Gary-Williams Real Estate.