The main distinguishing feature of the upper class is its ability to derive enormous incomes from wealth through techniques such as money management and investing, rather than engaging in wage-labor salaried employment, although most upper-class individuals today will still hold some sort of employment, which differs from historical norms. Successful entrepreneurs, CEOs, investment bankers, venture capitalists, heir to fortunes, celebrities, and a few number of professionals, are considered members of this class by contemporary sociologists, such as James Henslin or Dennis Gilbert.