Adebayo Ogunlesi, chairman of Global Infrastructure Partners, said he is going "to make Gatwick a truly first class experience".
However he cautioned it would take "somewhere between 12 and 18 months" before passengers started noticing a difference at the airport.
GIP agreed a £1.51bn deal with Gatwick's current operator BAA last week, which represented a "good price", Mr Ogunlesi said.