The first person who comes to mind for really smart person in P&W would have to be seabass. Eccentric as all hell, but he's a damn good programmer, and made the best sims for your nation and all that/to check ROI and all of that.
I'd also shout out to a couple people that aren't forum active or Ingame savvy, but just smart as shit, Saxasm and Bart from NPO. Both are very high level STEM people.
Roq's definitely a good people's person.
The King in Yellow is a good language person, and all around smart.
Aris is meh, better than most. (I'm kidding Aris plz no kill me).