Karney worked as a development engineer at Standard Telephones and Cables on a small team headed by British engineer Tommy Flowers, who designed Colossus, the world's first programmable electronic computer, used to break German wartime codes, particularly the Lorenz cipher.
Karney served as a development engineer at Standard Telephones and Cables under Tommy Flowers, a British engineer who created Colossus, the world's initial programmable electronic computer utilized for breaking German wartime codes, especially the Lorenz cipher.