Angel Builders

Naples is about as far from Palo Alto, Calif., as you can get, but David Diamond knows his way around Silicon Valley's technology capital.

Diamond and business partner John DeAngelis are better known for their successful Naples-based firm DeAngelis Diamond Construction, the fourth-largest commercial construction company on the Gulf Coast from Tampa to Naples.

But here's what you may not know about the two men: They love to invest in startup companies and help promising entrepreneurs. “It's actually my hobby,” says Diamond. “I don't golf, I don't fish.”