British Medical Journal, British Medical Journal (1924)
“ O'Sullivan was a fine classical scholar, and always kept in close touch with the progress of modern mathematics; many men holding chairs in that subject to-day would acknowledge him to be their master. His interest in the development of mathematical research did not interfere with his devotion to philosophy and the classics, and he probably had few equals in his knowledge of cellular pathology. He was an inspiring teacher; his laboratory was a rallying point for medical students and newly qualified physicians in search of advice and guidance. ”
