This is a question I ask myself now and then. Given the watch was launched in 1995, it's been 22 years in the market without changing its looks. I'd call that a classic design.
If I search the web for other classic designs I love, often it's not so hard to find the designer. You can google Rayban Wayfarer and find out that they were designed by Raymond Stegeman, for example.
Well, we know that Kikuo Ibe and his team designed DW-5000, which has been a classic for 35 years and still looks great and is really popular in its new encarnations. Solar, atomic, whatever, but same look.
Same goes for DW-6900, but who designed it? Like it or not, it's the most iconic G-Shock along with Kikuo Ibe's first model.
Not to mention Casio is making zillion of dollars with his creation. : )
This guy is alive somewhere and at this point I think he deserves some credit, don't you?