My granddad was probably an NT. He taught me about atoms and stuff! It's kind of cool knowing rather advanced chemistry and physics when you're still in primary school and it did spark my interest in science and philosophy. I only saw him about twice a year though, so I don't consider him to be a 'mentor' in my life, just an influence. He past away a little over a year ago.
I think my uncle is an NT as well, a chemist in profession and an amateur astronomer. He gave some quite interesting lectures on how elements heavier than Helium were formed in stars and came to earth. But he lives even further away and I saw him even less then my granddad in my youth.