wintercorn has resigned. this is how it was announced at the company headquarters. >>translator: dr. martin wintercorn has offered to step aside. we've accepted his recognition. dr. wintercorn has no further knowledge of the manipulation of the emission. he wants to give a clear signal, he's something we respect and value highly. >> he had been with them for more than 20 years. after achieving a doctorate, he started as an engineer. he moved swiftly through the ranks, after joining in 1993, and was credited for getting the beetle into production. he wanted vw to be the world's largest company. in 2015, they overtook toyota in global vehicle sales. >>> rob is here with more on that resignation. >> the executives who spoke to the press from the board said they do not know who is responsible for these emission test cheating, the software that was put into the cars to defeat the emissions testing over 11 million vehicles. so, martin wintercorn, the former head of the company, stressed in a statement that he didn't know anything about it. it begs the question exactly who did it because thi