Atlanta - James Collier has always been really good at math. And as a young man, he thought he would try his hand at teaching. “What I learned is that it wasn’t for me,” said the 82-year-old Atlantan with a wry chuckle. However, Collier, who quickly left the eight-grade classroom and went on to have a successful career at AT&T, has found another way to teach. People from all over the world seek him out for his seemingly endless knowledge of Chevrolet automobiles. - Todd Duncan Video by Tyson A. Horne ( Tyson.horne@ajc.com)