477 U.S. 242 (1986) Cited 235,866 times 38 Legal Analyses
Holding that summary judgment is not appropriate if "the dispute about a material fact is ‘genuine,’ that is, if the evidence is such that a reasonable jury could return a verdict for the nonmoving party"
557 U.S. 167 (2009) Cited 4,471 times 83 Legal Analyses
Holding that the Age Discrimination in Employment Act's language "because of such individual's age," required plaintiff show "age was the ‘but-for’ cause of the employer's adverse decision"
Holding that allowing the plaintiffs to proceed with a new theory of liability at summary judgment after the close of discovery would prejudice the defendants
Holding that comments such as "old timers" and "we don't necessarily like grey hair" do not necessarily defeat summary judgment in age-discrimination cases
Holding that statistical evidence could create an inference that a defendant discriminated against individual members of the class, but going on to analyze the remaining McDonnell Douglas burden-shifting prongs