High Quality Content by WIKIPEDIA articles! Ralph Hancock (2 July 1893 - 30 August 1950) was a Welsh landscape gardener and author. Hancock built gardens in the UK in the 1920s, 30s and 40s and in the United States in the 1930s. A few are well known - the roof gardens at Derry and Toms in London and the Rockefeller Center in New York, the garden at Twyn-yr-Hydd House in Margam and the rock and water garden he built for Princess Victoria at Coppins, Iver, England.