Abraham Walder

Ward Abraham (Hungarian: Wald Ábrahám, English: Abraham Wald, Yiddish: אברהם וואַלד; October 31, 1902 – December 13, 1950) was a Jewish Hungarian mathematician and statistician who made contributions to decision theory, geometry, and econometrics, and founded the field of sequential analysis. One of his famous statistical works, written during World War II, dealt with how to minimize bomber losses and account for survivorship bias in calculations. He spent his research career at Columbia University.