Robert Barr Smith had a genius for business. He was also a generous philanthropist, though his modesty dictated that much of the funding was dispensed anonymously.
Sir Charles Todd was a leader in the fields of meteorology, astronomy and communications, and is best remembered for masterminding the construction of the Overland Telegraph Line.
A pioneering neurosurgeon, Cairns worked extensively in the field of head injuries and was one of the first to promote the use of crash helmets for motor cyclists.
Best known as a governor of South Australia, Sir Mark Oliphant was also a pioneering nuclear physicist who became an outspoken anti-nuclear campaigner.