 After obtaining further experience in the United Kingdom, in 1974 he entered private practice as a general surgeon in Brisbane, and was appointed to the visiting staff of the Princess Alexandra Hospital.Over the succeeding 25 years, Theile earned an array of professional accolades.Alongside his fellowship of the Royal Australasian College of Surgeons, he was made a fellow of the Royal College of Surgeons of England, an Honorary Fellow of the Royal College of Surgeons of Edinburgh, and an Honorary Fellow of the Australian and New Zealand College of Anaesthetists.