Bequaert obtained a doctorate in botany at the University of Ghent in 1908. He was an entomologist, and from 1910 to 1912 he was part of la commission Belge sur la maladie du sommeil (Belgian Committee on sleeping sickness). From 1913 to 1915 he worked as a botanist in the Belgian Congo and also collected mollusks.
In 1916 he emigrated to the United States and was an associate researcher from 1917 to 1922 at the American Museum of Natural History. He became an American citizen in 1921, and taught entomology at the Harvard Medical School. From 1929 to 1956 he was Curator of Insects at the Museum of Comparative Zoology at Harvard, and was Professor of Zoology from 1951 to 1956 within the same institution.
Bequaert became president of the American Malacological Union in 1954. He left his post at Harvard in 1956. From 1956 to 1960 he lectured in biology at the University of Houston. With Walter Bernard Miller (1918–2000), he published The Mollusks of the Arid Southwest in 1973.
Memberships
He was a member of various learned societies: Zoological Society of France, the Entomological Society of America, the Belgian Royal Society of Entomology, the Belgian Society of Tropical Medicine, the Royal Institute of Colonial Belgium, Koninklijk Natuurwetenschappelijk Genootschap Dodonaea, and the Natural History Society of North Africa.
Bequaert J (1936). "A new North American mason-wasp from Virginia, with notes on some allied forms". Proceedings of the United States National Museum84 (3004): 79–87.
Bequaert J (1948). Monograph of the Strophocheilidae, neotropical family of terrestrial mollusks. Cambridge, Massachusetts: Museum of Comparative Zoology. 210 pp.
Bequaert J (1950). Studies in the Achatininae, a group of African land snails. Cambridge, Massachusetts: Museum of Comparative Zoology. 216 pp.
Bequaert J, Miller WB (1973). The mollusks of the arid Southwest, with an Arizona checklist. Tucson: University of Arizona Press. xvi + 271 p.
^Beolens, Bo; Watkins, Michael; Grayson, Michael (2011). The Eponym Dictionary of Reptiles. Baltimore: Johns Hopkins University Press. xiii + 296 pp. ISBN978-1-4214-0135-5. ("Bequaert", p. 23).
Abbott RT (1974). American Malacologists. A National Register of Professional and Amateur Malacologists and Private Shell Collectors and Biographies of Early American Mollusk Workers Born Between 1618 and 1900, American Malacologists (Falls Church, Virginie): iv + 494 p. ISBN0-913792-02-0
Lawalrée, A. 1983. Joseph-Charles Bequaert (1886-1982) comme botaniste. Bull. Nat.Plantentuin Belg., Bull. Jard. Bot. Nat. Belg. 53:3-16.