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|spouse = Phyllis Ashcroft Freeman (m. 1939)
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Prof '''Arthur Geoffrey Walker''' [[Royal Society of London|FRS]] [[FRSE]] (17 July 1909 in [[Watford]], [[Hertfordshire]], England – 31 March 2001)<ref>{{Cite journal | last1 = Hitchin | first1 = N. J. | doi = 10.1098/rsbm.2006.0028 | title = Arthur Geoffrey Walker. 17 July 1909 -- 31 March 2001: Elected FRS 1955 | journal = [[Biographical Memoirs of Fellows of the Royal Society]] | volume = 52 | pages = 413–421 | year = 2006
Together with [[Howard Percy Robertson|H. P. Robertson]], they devised the well-known [[Robertson–Walker metric|Robertson-Walker unit]] for the [[Friedmann–Lemaître–Robertson–Walker]] cosmological models, which are [[exact solutions in general relativity|exact solutions]] of the Einstein field equation. Together with [[Enrico Fermi]], he introduced the notion of [[Fermi–Walker differentiation]].
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