The first official BMX sanctioning body was the National Bicycle Association (NBA) started by Ernie Alexander in 1972. Like Scot Breithaupt, he had motorcycle motocross in his background, and like Scot he was a promoter but a professional one with his American Cycle Enterprises (ACE). He was also a former Hollywood stunt man who promoted races at the famous Indian Dunes, built and managed by Walt James, where many movies and TV shows were filmed. In 1970 he noticed a group of kids trying to organize a bicycle race with their Schwinn Sting-Rays. Being familiar with motorcycle racing, he lent the kids a hand. He later opened the Yarnell track, a steep downhill course every bit as treacherous by today's standards as Scot Breithaupt's BUMS track—if not more so. In 1972 he created the National Bicycle Association, modeled on the existing American Motorcycle Association (AMA). It was Mr. Alexander who built a truly nation-spanning professional sanctioning body for BMX.