PeopleJohn Paynter Joins Greenhill & Co.John Paynter, former vice chairman of JPMorgan Cazenove, has joined Greenhill & Co. as a senior advisor.ByPE Hub Staff26 March 2009•2 mins readJavaScript is required to read this article. Please enable it in your browser and reload the page.PeopleNorth AmericaUSBriefs