Clark served on numerous official committees during this period, and helped to stage a ground-breaking exhibition in Paris of works by his friend and protégé Henry Moore. He was more in sympathy with modern painting and sculpture than with much of modern architecture. He admired Giles Gilbert Scott, Maxwell Fry, Frank Lloyd Wright, Alvar Aalto and others, but found many contemporary buildings mediocre. Clark had been among the first to conclude that private patronage could no longer support the arts; during the war he had been a prominent member of the state-funded Council for the Encouragement of Music and the Arts. When it was reconstituted as the Arts Council of Great Britain in 1945 he was invited to serve as a member of its executive committee, and as chairman of the council's arts panel.