–Dave Johnson
Chief Design Engineer, Fisher Research Labs and First Texas Products (Teknetics and Bounty Hunter)

Designer of the following gold machines:
Fisher Gold Bug (no longer in production)
Fisher Gold Bug 2 (in production)
Tesoro Diablo Micromax (my personal all-time favorite gold machine, no longer in production)
Tesoro Lobo Supertraq (general purpose, in production)
White's GMT (in production)
White's MXT (general purpose, in production)

And also of the following general-purpose machines with serious gold prospecting capability:
Troy X-5 (no longer in production)
Teknetics T2 (in production)
Fisher F75 (in production)
Fisher F70 (in production)
Fisher F5 (in production)