Who's This? Ok, we've reached Who's Who Update '87, and he's the science guy on page 9 of the second issue!
How you could have heard of him: Darwin Jones has made minor appearances in various books since his Who's Who entry - in Power of the Atom #15 (1989), Action Comics #683 (1992) Underworld Unleashed: Patterns of Fear #1 (1995), and has more recently been referenced (but not seen) in Final Crisis and Justice League: Cry for Justice.
Example story: Strange Adventures #66 (1956) "Strange Secret of the Time Capsule!" by Otto Binder, Gil Kane and Bernard Sachs
The point of that ending? To be condescending to the guy from the future. This is why people don't like nerds.
Who's Next? I have half a mind to research Dr. Ub'x. He is a space beaver, after all.