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Murray Llewellyn Barr was born on June 20, 1908, in Belmont, Ontario.

He was a Canadian physician, medical researcher, and anatomist renowned for his co-discovery of sex chromatin, now known as the Barr body. This discovery was a cornerstone of human cytogenetics and led to major advancements in diagnosing genetic disorders. He studied at the University of Western Ontario (B.A, 1930; M.D., 1933; M.Sc.,1938). From 1939 to 1945, he was an RCAF wing commander. From 1936 to 1977, he served as a faculty member at the University of Western Ontario. He was also a member of the American Association for Anatomy and was nominated for the Nobel Prize in Physiology or Medicine. In 1968, he was made an Officer of the Order of Canada. In 1959, Barr received the Royal Society of Canada's Flavelle Medal. In 1962, he won the Joseph P. Kennedy Jr. Foundation Award for his contributions to understanding the causes of mental retardation. In 1963, he received the Gairdner Foundation International Award, and in 1972, he was elected a Fellow of the Royal Society of London. In 1998, he was posthumously inducted into the Canadian Medical Hall of Fame.

In 1934, he married Ruth Vivian King (1908–1995). He died on May 4, 1995, in London, Ontario.

Joachim Barrande was born on August 11, 1799, in Saugues, Haute Loire, France.

He was a French geologist and paleontologist. He studied engineering at the École Polytechnique and the École Nationale des Ponts et Chaussées in Paris. He worked as a tutor for the Duc de Bordeaux, who later became known as the Comte de Chambord, the grandson of Charles X. After the king's abdication in 1830, Barrande accompanied the royal exiles to England and Scotland, and later to Prague.

In Prague, he initially focused on engineering projects but soon developed an interest in fossils from the Lower Palaeozoic rocks of Bohemia. From 1840 to 1850, he studied these rocks, collected fossils, and documented approximately 3,500 species, including graptolites, brachiopods, mollusks, trilobites, and fish. Barrande supported the theory of catastrophism, as proposed by Georges Cuvier, and he rejected Charles Darwin's theory of evolution and the concept of species transmutation.

In 1852, he published the first volume of his significant work, "Système silurien du centre de la Bohême." Two additional volumes were published posthumously in 1887 and 1894. In recognition of his important research, the Geological Society of London awarded him the Wollaston Medal in 1857. He was elected to the American Philosophical Society in 1862, became a foreign member of the Royal Swedish Academy of Sciences in 1870, and was recognized as a Foreign Honorary Member of the American Academy of Arts and Sciences in 1875. Barrande bequeathed his extensive fossil collection to the National Museum in Prague. In 1884, the Barrande Rocks in Prague were named in his honour, and a large plaque bearing his name was placed at the site. In 1928, a district of Prague was named Barrandov in tribute to him.

He died on October 5, 1883, in Frohsdorf, Vienna, Austria.

Fred A. Barratt collected specimens in the Transvaal region of South Africa during the 19th century. He is known for sending bird specimens to major institutions, such as the Natural History Museum in London. There, English ornithologist Richard Bowdler Sharpe described a warbler species in 1874 (Bradypterus barratti).

Sir James William Barrett was born on February 27, 1862, in South Melbourne, Victoria, Australia.

He was an Australian ophthalmologist, academic administrator, and author. He was educated at the University of Melbourne (M.B., 1881; Ch.B., 1882) where he became the first secretary of the Medical Students' Society in 1880. In 1890, he founded the Australian Medical Journal in Melbourne. He worked for two years as a resident medical officer at the Melbourne Hospital where he became a strong advocate of antisepsis.

In 1883, he went to King’s College in London (M.R.C.S., 1884; F.R.C.S., 1887) where his professor G. F. Yeo remarked on his earnestness, quickness, assiduity, urbanity, and courtesy. Sir Barrett taught at King's College, Moorfields Ophthalmic Hospital and elsewhere, gaining his main source of income from coaching in physiology for F.R.C.S. examinations.
He visited Austria and Germany and developed a lifelong affection for German language, literature and music, together with an attachment to the scientific rationality and agnosticism of Thomas Huxley. He researched the anatomy of the mammalian eye, published seventeen papers, and decided to spend his life in London on investigative work, but in 1886, he was called back to Australia for family reasons.

He served as Vice-Chancellor of the University of Melbourne from 1931 to 1934, and then as Chancellor from 1935 to 1939. He was President of the British Medical Association from 1935 to 1936, and the inaugural president of the Victorian Town Planning and Parks Association, now the Town and Country Planning Association. He was a notable supporter of Jewish refugee migration to Australia by persons fleeing Nazism.

In 1888, he married Marian Rennick (1861–1939) and in 1940, he remarried Monica Ernestine Heinze (1889–1950). He died on April 6, 1945, in Toorak, Melbourne, Victoria, Australia.