John Alexander McClelland FRS (1 December 1870 – 13 April 1920) was an Irish physicist known for pioneering work on the scattering of β rays, the conductivity of gases, and the mobility of ions.
In 1895 he received a fellowship from the Royal University of Ireland and spent 1896–1900 at Cavendish Laboratory, while pursuing a research degree at Cambridge.
[2][1] In 1900 he was appointed Professor of Experimental Physics at University College, Dublin.
[3] Among his other posts McClelland served as a Commissioner of National Education, a member of the Senate of the National University of Ireland and, in 1907, secretary to the Royal Irish Academy.
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