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was the son of Thorburn Robertson and Sheila, daughter of William Brailsford. He was born in Edinburgh in 1884 and at eight years of age was brought to South Australia, where his father had received an appointment as a mining engineer. He was educated at Miss Stanton's school at Glenelg, and later was privately tutored for the university. He entered on the science course at the university of Adelaide in 1902, and was at once recognized as a brilliant student. In April 1905 he graduated B.Sc. with first-class honours in physiology. As a student he had given some evidence of his quality in a paper on the "Sham-death reflex in spiders", published in the Journal of Physiology for August 1904, and in a remarkable paper, "An Outline of a Theory of the Genesis of Protoplasmic Motion and Excitation", read at a meeting of the Royal Society of South Australia on 4 April 1905 and published on pages 1-56 of its Transactions and Proceedings, vol. XXIX. He had been much interested in the work of Professor Jacques Loeb of the university of California, one of the ablest biochemists of his time, and immediately after graduation obtained a position in his laboratory. There he worked for five years, contributing during this period about 40 papers to leading scientific journals, and establishing a reputation as an authority on proteins. He never lacked courage, and thus early in his career attacked and subsequently refuted many of the doctrines then generally accepted. In 1910 when Loeb went to the Rockefeller Institute, New York, Robertson became assistant professor of bio-chemistry and pharmacology. He published in 1912 Die Physikalische Chemie der Proteine, which was translated into Russian, and, extended and revised, was published in English in 1918. Between 1910 and 1918 he sent a steady stream of papers to the scientific journals, many of them concerned with the factors that govern the growth and longevity of animals. He became professor of bio-chemistry and pharmacology at the university of California in 1916 and two years later was given the chair of bio-chemistry at Toronto. In 1919 the death of his old teacher, Sir Edward Stirling (q.v.), led to his return to Adelaide, where he became professor of bio-chemistry and general physiology in 1920. There his energetic personality soon became apparent in the medical school. His influence was felt in a remodelling of the early years of the medical course, and he persuaded the council that the teaching would have to be divided. In 1922 the new chair of zoology was established. He published in 1920 at New York his Principles of Biochemistry (2nd ed. 1923), and in 1923 appeared The Chemical Basis of Growth and Senescence. He had been experimenting on these problems since 1914, and though he was devoting much time to other work, they remained a constant hobby with him for the rest of his life. He was one of the earliest in Australia to investigate the use of insulin for diabetes, and in 1923 he discovered tethelin, a growth controlling substance which has been found of great value in the treatment of slow-healing wounds and ulcers of long standing.

In 1927 Robertson was asked by the Commonwealth Council for Scientific and Industrial Research to take charge of investigations into the nutrition of animals. An animal nutrition laboratory was built at Adelaide, and field stations were established in Queensland, New South Wales, Victoria and South Australia. Some especially valuable research work was done in connexion with the growth of wool on sheep, and the value of cystine and phosphates as supplementary feeding. He was working with great energy, with much mapped out for the coming years, when he contracted pneumonia and died after a short illness on 18 January 1930. He married in 1910 Jane Winifred, third daughter of Sir Edward Stirling, who survived him with two sons and a daughter. He was a fellow of the American Association for the Advancement of Science, and of many other important societies. He was elected a foreign member of the Accademia Nazionale dei Lincei, Rome, in 1926. In addition to the books already mentioned he published in 1914 The Universe and the Mayonnaise and other Stories for Children, and in 1931 a collection of excellent articles of more general appeal than his scientific papers was published under the title The Spirit of Research. He was the virtual founder and was managing editor of the Australian Journal of Experimental Biololgy and Medical Science from its beginning until his death. Its ninth volume published in 1932, "The Robertson Memorial Volume", is made up of scientific papers contributed by former colleagues and pupils, with a short memoir by Hedley R. Marston, and a bibliography of his work which lists 174 of his articles, and 26 others of which he was part author.

Apart from his life-work Robertson was a man of wide culture with a stimulating and unselfish personality, much interested in art, literature, music, and philosophy. He had a great sense of justice, complete loyalty and tolerance, qualities which endeared him to his co-workers and students. In his work his commonsense, courage, vision and imagination were always present. It is possible that, as has been suggested, his practical work was of less significance than his work in the realm of ideas where he was constantly evolving fresh thoughts or throwing new light on old ones. He was only 45 when he died, and given a few more years would no doubt have succeeded in rounding off much that was still incomplete. He left a body of disciples who have carried on his work and established a tradition that will be a lasting memorial of a great scientist.