Graham Carey describes TD’s background in The Catholic Art Quarterly, Vol XVIII, No 2, Easter 1955.
Thomas Derrick lived and worked in the spirit of the English Traditionalists. The personality that most profoundly influenced him was that of William Richard Lethaby, to whom he always referred as “my master”, and whose aphorisms he was never tired of repeating. For the generation in which young Thomas grew up, Lethaby was the prophet and guide of the forces which had been set in motion earlier by John Ruskin and William Morris. Among his friends were such men as Hilaire Belloc, Gilbert Chesterton, Ananda Coomaraswamy, and Ernest William Tristram. When he set about to relearn penmanship, it was Edward Johnston who taught him, and when he made his submission to the Church, it was Father Vincent McNabb who received him.
His religious art included many stained glass windows.