Arthur Pentland Dempster is a Professor Emeritus in the Harvard University Department of Statistics. He was one of four faculty when the department was founded in 1957.
He was a Putnam Fellow in 1951. He obtained his Ph.D. from Princeton University in 1956. His thesis, titled The two-sample multivariate problem in the degenerate case, was written under the supervision of John Tukey.
A. P. Dempster, N. M. Laird and D. B. Rubin. (1977). "Maximum Likelihood from Incomplete Data via the EM Algorithm," Journal of the Royal Statistical Society, B, vol. 39, no. 1, pp. 1-38. (The authors collected a variety of maximum likelihood problems and methods of solving these problems that occurred in the literature. They found that all of these methods had some ideas in common and they named it the EM Algorithm, standing for "Expectation, Maximization".)
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