Came over here to post about this.
A man who knew how to get to infinity and beyond, whose great experiment to dis/prove time travel was to throw a party and see if anyone showed up, who liked to run his students down in a souped up chair, who was beloved by his children's friends for never talking down to them and always answering their questions without berating them, who defied expectations, who made himself known and seen and heard, who poked fun at himself when afforded the opportunity, and who literally redefined the universe as we know it.
He was Riker's Data's poker buddy, Sheldon's nemesis / inspiration, and on occasion his own animated head.
This is how a titan falls.
Godspeed, sir. RIP.