After joining Roche Pharmaceuticals in 1987, Mr. O’Day held various positions in the United States before moving to Roche headquarters in Switzerland in 1998. During his time in Switzerland, he held leadership roles in Global Marketing and Lifecycle Management. In 2001, he moved to Tokyo to become Head of Corporate Planning for Roche Pharmaceuticals in Japan and later moved to Denmark to serve as General Manager. He became President of Roche Molecular Diagnostics in California in 2006 and subsequently returned to Roche headquarters to lead the Diagnostics Division before assuming his current position.

“I have long admired Gilead for its work to develop medicines that have fundamentally changed the way HIV and viral hepatitis are treated. The company has successfully grown into a global organization, providing access to people around the world, while maintaining its focus on innovative science,” said Mr. O’Day. “Together with the Board, leadership team and Gilead’s 11,000 employees, I look forward to building on this in ways that I believe will – in keeping with Gilead’s mission – transform the lives of millions of individuals.”