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Sigma Xi, The Scientific Research Honor Society (ΣΞ) is a non-profit honor society for scientists and engineers. Sigma Xi was founded at Cornell University by a junior faculty member and a small group of graduate students in 1886 and is one of the oldest honor societies. Membership in Sigma Xi is by invitation only, where members nominate others on the basis of their research achievements or potential. Sigma Xi goals aim to honor excellence in scientific investigation and encourage cooperation among researchers in all fields of science and engineering. Many of the world's most influential scientists have been members of Sigma Xi, such as Albert Einstein, Linus Pauling, Barbara McClintock, and Sally Ride.