Prior to his nomination as Deputy Secretary, Turk was the Deputy Executive Director of the International Energy Agency (IEA), where he focused on helping countries around the world tackle their clean energy transitions. He also directed reports on the digitalization of energy systems, the future of clean hydrogen, and a project tracking progress on a wide range of clean energy technologies.

During the Obama-Biden Administration, Turk coordinated international technology and clean energy efforts at DOE. During this time, he helped spearhead the launch of Mission Innovation—a global effort to enhance clean energy innovation.