[3] At the behest of British architect John Pawson, in the late 1960s de Groen left Australia to travel abroad, teaching and exhibiting in England, France, and Canada from 1968 until 1973.
[4][5] A series of recorded interviews which de Groen did with 26 prominent Australian artists is held in the oral history collection of The National Library of Australia in Canberra.
[8] In 1985 Geoffrey de Groen left the National Art School/East Sydney Technical College, where he had been teaching, to paint full-time.
In 1992 de Groen moved to the New South Wales regional town of Taralga, where he established a large gallery and working space in refurbished outbuildings near his home.
In 2009 the Goulburn Regional Art Gallery featured an exhibition of a decade of works by de Groen, entitled "Made in Taralga".