Trecora Resources Appoints Karen A. Twitchell as Chair of the Board of Directors SUGAR LAND, Texas, February 14, 2019 /PRNewswire/ — Trecora Resources (“Trecora”) (NYSE: TREC), a leading provider of high purity specialty hydrocarbons and waxes, today announced that Karen A. Twitchell has been appointed Chair of the Company’s Board of Directors (the “Board”), effective February […]