Leo Weinberg, analytical chemist, was the son of Edward Weinberg and his wife Fanny. He received his secondary schooling at the Christian Brothers College, Kimberley, and passed the matriculation examination of the University of the Cape of Good Hope in 1912. Continuing his studies at the South African College, Cape Town, he was awarded the BA degree with honours in applied mathematics in 1915. By 1917 he was living in Johannesburg and was employed at the South African School of Mines and Technology (from 1921 the University of the Witwatersrand). He was a member of the South African Geographical Society at that time and was scheduled to deliver a lecture on 'The weather' to its members in 1918. In 1917 he became a member also of the South African Association for the Advancement of Science. Years later he contributed a paper on 'The sampling and assaying of South African chrome ore' to the South African Mining and Engineering Journal (1931, Vol. 42(1), pp. 453-454). On his death certificate his profession is given as analytical chemist.
Weinberg was married to Sarah Bertha Weinberg, with whom he had a son and a daughter.