Mongredien was born in London some time in 1807, and died at Forest Hill, Kent on 30 March 1888. His father was a French army officer who had opposed Napoleon and been forced into exile in England in 1798. His name was properly spelled Mongrédien, but in his published work he dropped the accent to become Mongredien. Educated at a Roman Catholic school at Penn, Buckinghamshire, Mongredien then became a clerk in a London commercial firm. He Rose rapidly in business, and in 1859 became a partner in the import-export firm H.J. Johnston & Co.; in 1864 he set up an independent business as a corn broker. He was also involved in overseas trade, especially with Turkey and Egypt.
From The Biographical Dictionary of British Economists in Oxford Reference.