Comment by Hamuko

The guy lead the emission compliance unit in the US. He was most likely in charge of taking the software designed in Germany and adapting it so that it works with the emission tests performed in the US. As far as I can remember, the software was pretty closely monitoring the driving style and comparing it to the test suite that was performed in the EU in order to activate the cheats. They probably had to perform the same kind of thing in the US, as I assume that the tests differ.