Michael Schumacher had a "completely different" persona to what Formula 1 fans got to see on race weekends, according to one of his former colleagues.
The German remains, in the eyes of many fans, the greatest driver the sport has ever seen. His record of seven world titles can be matched only by Lewis Hamilton.
So there was much fanfare when he came out of retirement to help launch the new Mercedes team in 2010. The carmaker took over the Brawn GP team which had just won the championship the previous year.
