Like a lot of people who attend a Gunsmithing school he probably got a real job so he can eat regular. I know I did. Gunsmith school and especialy Gunsmithing schools through college programs tend to prepare you for the reality of lifes. The gunsmithing and machining course served me well. But the mandatory business administration and computer classes are the ones that gave me the skills to make a living.
That being said, it is a very real possiblity your friend isn't making cannons for a living but working at some other related trade.
So first go to google and type his name in, then query any address you might have had for him and then any phone number. After that go to
www.whitepages.com and search there.
Good luck.