The twentieth-century physicist appears twice as a holodeck recreation, debating a super-intelligent Reginald Barclay in The Nth Degree and playing poker with Data, Newton and Hawking in Descent.
Albert Einstein, the Earth physicist who formulated the theory of relativity, is seen in The Next Generation only as a holodeck recreation, played both times by Jim Norton.
In The Nth Degree, Reginald Barclay, his intellect vastly enlarged by a Cytherian probe, is found on the holodeck arguing advanced physics with a simulated Einstein and correcting the equations on his blackboard. The scene is one of the first signs for the crew of how far Barclay has changed.
In the opening of Descent, Data sets up a poker game with holograms of Einstein, Isaac Newton and Stephen Hawking to see how three great minds would interact. Einstein proves cheerfully poor at working out what he owes the pot, and loses the hand to Hawking.