Mayor Kasim Reed has appointed John R. Seydel III the new director of the office of sustainability for the city of Atlanta. Seydel replaces Stephanie Stuckey Benfield, the city’s new chief resilience officer.

Previously, Seydel was CEO of the Revolution Nation, a group connecting millennials to their elected representatives. He has also worked with the United Nations and the Southern Co. in renewable energy and with the Captain Planet Foundation. He serves as associate trustee of the Turner Foundation.

Seydel received his bachelor’s degree in political science from the University of Denver. In his new role, Seydel will work across departments within the city of Atlanta and with a host of external partners in the areas of nonprofit, business, community and academia.