\biohead{Jonathan Tong Barker}{}{Jonathan T. Barker, DSc (Uncle Don).\cite{JTBphoto}}

Jonathan Tong Barker (known as Don) was born in 1883 \cite{JTBarkerBirth} in Liverpool, Lancashire, to \bioref{Thomas_Henry_Barker} and \bioref{Mary_Ellen_Moulsdale}. He had six siblings: \bioref{James_Denton_Barker}, \bioref{Charles_Frederick_Strangeways_Barker}, Reverend \bioref{Thomas_Percy_Conyers_Barker}, \bioref{Francis_Darcy_Mead_Barker}, \bioref{William_Danby_Holt_Barker}, and \bioref{Henry_Bertram_Mitford_Barker}.

He gained a PhD in chemistry, and worked for some years for a chemical company in the United States. (He is recorded as arriving in New York, en route to Bay City, Michigan, on 3 December 1919, en route to Bay City, Michigan and his next of kin is given as his mother. He returned to Liverpool on 29 November 1920 on the Baltic.\cite{JTBarkerTravel1}) He coauthored a paper with F. G. Donnan in 1911: \emph{An Experimental Investigation of Gibbs' Thermodynamical Theory of Interfacial Concentration in the Case of an Air-Water Interface}, that was published in the Proceedings of the Royal Society.\cite{RSPA}

He married \bioref{Gladys_Bythell_Edwards} in Holywell, Flintshire, in the first quarter of 1921. \cite{JTBarkerMarriage} They had no children.

Then, on 3 July 1921, he is back in the USA on his way to Bay City having left Liverpool on 25 June, and this time he was travelling with his wife. They returned on 2 October 1921 travelling first class on the Caronia \cite{JTBarkerTravel2}; at the time, they were living at Ormsby, West Kirby, Cheshire.

He died on 4 February 1950 and was then living in Holywell, Flintshire, Wales and Probate was granted on 24 April 1950 as follows: ``Probate: Barker Jonathon Tong of Victoria Villa, Halkyn Street, Flint died 4 February 1950. Probate Bangor 24 April to Gladys Bythell Barker widow and Wilfred Bythell Edwards university professor. Effects \pounds1108.~12s.~7d''