Caption: Sir Harold Jeffreys (1891--1989) was one of the leading developers of Bayesian analysis---no relation to yours truly though he manages to look a lot like the father of yours truly anyway.

See also Harold Jeffreys: Old/Young.

Bayesian analysis started with the discoverer and eponym of Bayes' theorem, Thomas Bayes (c.1701--1761).

Pierre-Simon Laplace (1749--1827) and Harold Jeffreys greatly extended it.

Credit/Permission: Anonymous photographer, circa late 20th century / No permission.
Image link: MacTutor History of Mathematics archive: Harold Jeffreys: Image link direct: Sir Harold Jeffreys (1891--1989) image.
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