"He's been aware of the health and safety challenges that Suncor has since before he was president and CEO," Tucker said. "It's not like he's new to this." Suncor's record on safety was also criticized by activist investor Elliott Investment Management LP in a public letter to the company's board of directors last April. The U.S. firm, which owns a 3.4 per cent stake in Suncor, criticized the company for missed production targets, delayed timelines, and repeated safety failures. It also called for a shakeup at the top with the appointment of five new directors, as well as a review of management and assets.