Rebecca Mark-Jusbasche

Known as “Mark the Shark” for her negotiating skills, Mark was one of the most senior female executive in the energy industry in the 1990s, rising to chief executive of Enron International and serving as a member of the company’s board. She spun off the company’s water business, Azurix, in a 1999 IPO, but lost a power struggle to Skilling and resigned from Enron in 2000. She was never accused of any involvement in the fraud that emerged in late 2001. Now Mark-Jusbasche, she invests in energy technology, water and agricultural projects with a focus on sustainable development.