Who's This? A short head shrinker.
How you could have heard of him: I know no one really watched Powerless, but he showed up live action on that show. He has a bigger role on the Harley Quinn animated series.
Example story: Wonder Woman #160 (February 1966) "Dr. Psycho's Revenge!" by Robert Kanigher, Ross Andru and Mike Esposito
From this one tale, picked at random from the Earth 2-going-on-40 canon, I can certainly see how the modern era made Dr. Psycho more and more monstrous.
Who's Next? Sun Boy's maker.