Career
When the London County Council (LCC) was created in 1889, Cooper was elected as a councillor for Bermondsey, standing for the Progressive Party, the municipal organisation of the Liberals. He was re-elected five times, holding the seat at the 1904 elections. He then resigned from the LCC. Whilst an Member of Parliament he voted in favour of the 1908 Women"s Enfranchisement Bill.
He died in 1909, aged 65.
At the resulting by-election for his seat, Alfred Salter, who had succeeded Cooper on the LCC, stood as an Independent Labour Party candidate. However, the Liberals regained it within months, at the general election in January 1910.