[1] The younger William Edward Trevithick was a gardener at Headfort House from the age of 13, followed by employment at Belvoir Castle, next at the National Botanic Gardens, Glasnevin, and finally (beginning in 1920) at Kew, where he worked in the herbarium.
[2][3][4] Trevithick produced illustrations for Flora of West Tropical Africa by John Hutchinson and John McEwen Dalziel, Flora Malesiana, and Curtis's Botanical Magazine.
[2] He served in World War I, later worked as a commercial artist after starting his own advertising company in the 1930s.
His work featured on the covers of Flight International Magazine and Airplane.
Being an enthusiastic aviator, he qualified as a pilot and became a member of the Royal Aero Club.