RT @SPE_PennState: Industry legend retiring: thanks Dr. Terr aspwv1970-01-01T00:00:00-05:00January 1st, 1970|Twitter| RT @SPE_PennState: Industry legend retiring: thanks Dr. Terry Engelder for yrs of service @penn_state. Truly sparked the #shale boom across… Share This Story, Choose Your Platform! FacebookTwitterRedditLinkedInWhatsAppTumblrPinterestVkEmail