 "Text Book of Surgical Treatment" (1942) would be issued in a fourth edition in 1952.He was also awarded lectureships and travelled abroad during this period, such as when he delivered the 1958 Strauss Lecture under the title 'The Endocrine Aspects of Breast Cancer'.In 1960, Illingworth was the first McLaughlin Foundation-Edward Gallie Visiting Professor, in which capacity he visited several universities and hospitals in Canada to teach and lecture.