From 1907 Koppers worked in the USA for some time, and in 1912 founded Koppers Inc in Chicago, Illinois, an industrial organization now based in Pittsburgh, Pennsylvania, United States.
In 1943, Koppers, at the US Government's behest, built a factory in Kobuta, Pennsylvania on the left bank of the Ohio River just downriver from Beaver, to manufacture styrene-butadiene monomer, a building block used to make a form of synthetic rubber for the World War II defense effort.
Originally the estate comprised CSR Chemicals, Titans, Koppers, and part of the BHP Steelworks (No2 Merchant Mill, Rod Mill, Limestone Kiln and Spares Yard).
The Villa Koppers, Moltkeplatz No. 61, the former residence of the industrialist Heinrich Koppers, now houses the International School Ruhr.
In 1981, Kelly released the album, Tell Me, through Baby Records in Italy, featuring "Patty Cake", produced by Jürgen Koppers.