Broom was born at 66 Back Sneddon Street in Paisley, Renfrewshire, Scotland, the son of John Broom, a designer of calico prints and Paisley shawls, and Agnes Hunter Shearer. In 1893, he married Mary Baird Baillie, his childhood sweetheart. In his medical studies at the University of Glasgow Broom specialised in obstetrics. After graduating in 1895 he travelled to Australia, supporting himself by practising medicine. He settled in South Africa in 1897, just prior to the South African War. From 1903 to 1910, he was professor of Zoology and Geology at Victoria College, Stellenbosch, but was forced out of this position for promoting belief in evolution. He established a medical practice in the Karoo region of South Africa, an area rich in Therapsid fossils. Based on his continuing studies of these fossils and mammalian anatomy he was made a Fellow of the Royal Society in 1920. Following the discovery of the Taung child he became interested in the search for human ancestors and commenced work on much more recent fossils from the dolomite caves north-west of Johannesburg, particularly Sterkfontein Cave. As well as describing many mammalian fossils from these caves he identified several hominin fossils, the most complete of which was an Australopithecine skull, nicknamed Mrs Ples, and a partial skeleton that indicated that Australopithecines walked upright. Broom died in Pretoria, South Africa in 1951.
Contributions
Broom was first known for his study of mammal-like reptiles. After Raymond Dart's discovery of the Taung Child, an infant australopithecine, Broom's interest in palaeoanthropology was heightened. Broom's career seemed over and he was sinking into poverty, when Dart wrote to Jan Smuts about the situation. Smuts, exerting pressure on the South African government, managed to obtain a position for Broom in 1934 with the staff of the Transvaal Museum in Pretoria as an Assistant in Palaeontology. In the following years, he and John T. Robinson made a series of spectacular finds, including fragments from six hominins in Sterkfontein, which they named Plesianthropus transvaalensis, popularly called Mrs. Ples, but which was later classified as an adult Australopithecus africanus, as well as more discoveries at sites in Kromdraai and Swartkrans. In 1937, Broom made his most famous discovery, by defining the robust hominin genus Paranthropus with his discovery of Paranthropus robustus. These discoveries helped support Dart's claims for the Taung species. For his volume, The South Africa Fossil Ape-Men, The Australopithecinae, in which he proposed the Australopithecinae subfamily, Broom was awarded the Daniel Giraud Elliot Medal from the National Academy of Sciences in 1946. The remainder of Broom's career was devoted to the exploration of these sites and the interpretation of the many early hominin remains discovered there. He continued to write to the very last. Shortly before his death he finished a monograph on the Australopithecines and remarked to his nephew:
Spiritual evolution
Broom was a nonconformist and was deeply interested in the paranormal and spiritualism; he was a critic of Darwinism and materialism. Broom was a believer in spiritual evolution. In his book The Coming of Man: Was it Accident or Design? he claimed that "spiritual agencies" had guided evolution as animals and plants were too complex to have arisen by chance. According to Broom, there were at least two different kinds of spiritual forces, and psychics are capable of seeing them. Broom claimed there was a plan and purpose in evolution and that the origin of Homo sapiens is the ultimate purpose behind evolution. According to Broom "Much of evolution looks as if it had been planned to result in man, and in other animals and plants to make the world a suitable place for him to dwell in." After discovering the skull of Mrs. Ples, Broom was asked if he excavated at random, Broom replied that spirits had told him where to find his discoveries.
Publications
Among hundreds of articles contributed by him to scientific journals, the most important include:
"Fossil Reptiles of South Africa" in Science in South Africa
"Reptiles of Karroo Formation" in Geology of Cape Colony
