MarcellusGas-248822083835011075 aspwv1999-11-30T00:00:00-05:00November 30th, 1999|Twitter| XTO Energy president Jack Williams now keynoting #SGI2012 cc: @exxonmobil #ShaleGas #Marcellus Share This Story, Choose Your Platform! FacebookTwitterRedditLinkedInWhatsAppTumblrPinterestVkEmail