What is Sergio Marchionne’s legacy at Fiat Chrysler? Sergio Marchionne, who has died today aged 66, leaves behind a legacy like few others. He has steered the Fiat Chrysler Automobiles company he helped create through turbulent times, leading the merger of the two firms, and attempting to balance the Italian and American sensibilities of them.Under Marchionne, Jeep has developed into a truly global brand, Alfa Romeo and Maserati have grown and Ferrari has been spun off as its own company. Conversely, the Fiat and Chrysler brands have both struggled, arguably hamstrung by a lack of clear vision.Marchionne had clearly been preparing FCA to continue without him. The fact that it’s happened sooner than expected, and in such difficult circumstances, will show how well he has done that. Even if he hasn’t left a script, Marchionne’s biggest legacy could be how well FCA copes with such a dramatic transition of power.