A renowned physicist from Earth's 20th century, Einstein's articulation of fundamental principles of space-time, energy, light and gravitation revolutionized human scientific and philosophical thought.
The U.S.S. Enterprise-D featured Einstein in various holodeck programs. In 2367, Reginald Barclay, using his Cytherian-enhanced intelligence, spent a night discussing grand unification theories with a holodeck simulation of Albert Einstein. The holographic Einstein was later enlisted by Data, to participate in a custom-designed poker game on the holodeck. Here, Data could play with other such scientific luminaries as Sir Isaac Newton and Professor Stephen Hawking.