 Wilkinson was elected to the Royal Institute of Painters in Water Colours (RI) in 1906, and became its President in 1936, an office he held until 1963.He was elected Honourable Marine Painter to the Royal Yacht Squadron in 1919.He was a member of the Royal Society of British Artists, the Royal Institute of Oil Painters, the Royal Society of Marine Artists, and the Royal Scottish Society of Painters in Watercolour.