In partnership with Abram S. Hewitt, Cooper operated an iron works in Trenton, New Jersey. Edward Cooper also became a metallurgist and inventor, developing several improvements to iron making and metalworking. He declined to patent his inventions, believing that they could better serve the public if he made them widely available. After Peter Cooper's death in 1883, Edward Cooper succeeded to the presidency of the Cooper Union. Active in politics as a Democrat, Cooper was a delegate to The 1860 Democratic National Convention in Charleston, South Carolina, and the 1876 Democratic National Convention in St. Louis. With Hewitt, Samuel J. Tilden and others, Cooper was recognized as a leader of the Swallowtails, named for the Swallowtail coat. The Swallowtails were prominent Democratic businessmen and professionals who opposed the Tammany Hall Democratic organization and attempted to introduce government reforms and end corruption. Cooper served as a member of the Committee of Seventy, which investigated and prosecuted Tammany Hall corruption. In 1875, Tilden was Governor of New York, and named Cooper to a commission which proposed anti-corruption reforms for inclusion in the New York Constitution. By the late 1870s, Cooper was part of the Irving Hall Democrats, another organization which opposed Tammany. In 1878, Cooper ran successfully for mayor, supported by anti-Tammany Democrats, Republicans, and independents. He defeated Augustus Schell, who ran with Tammany support. During his two-year term Cooper promoted reform of the city's sanitation service and tenement laws. He was succeeded by William Russell Grace, another anti-Tammany Democrat. In 1890, Abram S. Hewitt partnered with Edward Cooper and Hamilton M. Twombly in forming the American Sulphur Company. That company then entered into a 50/50 agreement with Herman Frasch and his partners to form the Union Sulphur Company
Society life
In 1892, Cooper and his wife were included in Ward McAllister's "Four Hundred", purported to be an index of New York's best families, published in The New York Times. Conveniently, 400 was the number of people that could fit into Mrs. Astor's ballroom.
Personal life
In 1854, Cooper was married to Cornelia Redmond, the daughter of James Morton Redmond and Anne Redmond. Together, they were the parents of two children, only one of whom lived to maturity:
