 Enron Development Corp. became Enron International in 1993, and Mark became Enron International's CEO in 1996, developing and operating power and pipeline assets around the globe and greatly expanding Enron's global portfolio.In 1998 and 1999, Mark was listed as one of "Fortune"s "50 Most Powerful Women" in American business.Ideological conflict and rivalry within Enron arose between Mark, who specialized in hard assets and facilities, and fellow top executive Jeff Skilling, who pushed for the company to develop and expand its financial trading and risk management sectors instead.