John David Gwynn

John David Gwynn (13 July 1907 – 21 November 1998),) was a civil engineer with a special interest in renewable energy generation. In his youth he was one of Ireland's most distinguished cricketers.

John David Gwynn (known to family and friends as “David” or “JD”) was born in Dublin on 13th July 1907. He was the eldest child of Edward Gwynn, an academic and sometime Provost of Trinity College, Dublin, and Olive Mary Gwynn née Ponsonby. In accordance with family tradition he was educated at St Columba's College, Dublin and then at Trinity College, Dublin University where he studied civil engineering. While still an undergraduate he was employed by the Siemens company to assist in their work on the Shannon hydroelectric scheme.

J D Gwynn went on to become a chartered civil engineer, a Fellow of the Institution of Civil Engineers and a Member of the Institute of Mechanical Engineers. After graduating BAI in 1930 he worked on Newport Bridge in Middlesbrough as an employee of the company Mott, Hay and Anderson. In 1936 he joined Balfour Beatty and was engaged on the extension of the Piccadilly Line for London Transport.

In the early 1940s J D Gwynn was again involved in developing hydro-electric power infrastructure, this time in Scotland. As the second World War continued he was put in charge of building the Churchill Barriers in Scapa Flow, Orkney, a task which occupied him from 1942 to 1944.

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