A holodeck recreation of the physicist Albert Einstein, summoned by the newly brilliant Reginald Barclay for a blackboard debate and later by Data for a game of poker.
The holographic Albert Einstein is a holodeck simulation of the 20th-century physicist, played in both of his appearances by Jim Norton.
He is first seen in the fourth-season episode The Nth Degree. Barclay, his intelligence vastly enlarged by an alien probe, creates the simulation so that he has someone to argue with about physics, and Counsellor Troi finds the two of them at a blackboard with Barclay correcting the great man's mathematics.
The character returns in Descent, Part I, at the end of the sixth season, when Data sets up a poker game between himself and holograms of Einstein, Isaac Newton and Stephen Hawking, the last played by Hawking himself. Einstein loses the hand, and bickers with Newton while doing so.