Fernando,
I don't think you will succeed in contacting Dave Fulton. Even if you obtain the unlisted address and/or phone number, the Fulton's are not involved with any type of interviews or communications about FoxPro, they haven't for many years and I don't think they intend to start now. What Dave Fulton did for FoxPro and for the FoxPro community is great, but he has other interests now and has moved on. I'm telling you this to avoid having you spend any additional time in your contact effort.