Executive Leadership

Jennifer Toth was appointed director of the Arizona Department of Transportation on January 5, 2023, to lead the agency responsible for planning, designing, building, maintaining and operating the state’s multimodal transportation system, managing transportation revenue, and providing motor vehicle title, registration and driver license services. Jennifer has over 25 years of experience in the...

Greg Byres serves as deputy director/ state engineer for transportation. Supervising the Infrastructure Delivery and Operations Division (IDO), Transportation Systems Management and Operations Division (TSMO), and the Multimodal Transportation Division (MPD), he leads development and delivery of the ADOT construction program, including environmental studies, engineering design, land acquisition...

Teresa Welborn serves as chief operating officer/deputy director for the Arizona Department of Transportation. Teresa has more than 30 years in the non-profit and government sectors, most recently at Maricopa County Department of Transportation serving as the Administrator from 2014 – 2020. In this role Teresa led the Communications, Administrative Services, Information Technology and Finance...

Kristine Ward serves as the chief financial officer and deputy director, which oversees Financial Management Services, Budget and Research, Procurement and Information Technology Group. She has been with the Arizona Department of Transportation since December 2011. Prior to joining ADOT, Kristine served as the deputy director for the Department of Revenue (DOR) from 2005 to 2011. As deputy...

Floyd Roehrich, Jr., currently serves as deputy director of Business Enterprise for ADOT. He serves as the primary liaison between ADOT and the State Transportation Board, and oversees the Administrative Services Division, Arizona Highways, Office of Safety and Customer Relations Stakeholder offices. Floyd also works with Arizona’s metropolitan planning organizations, councils of government, the...

Wayde Webb serves as deputy director for Motor Vehicle Division and Compliance. Prior to joining ADOT in 2023, Wayde worked in law enforcement at the Arizona Department of Public Safety (DPS) for more than 28 years including serving as Human Resources Assistant Manager, Legislative Liaison, Chief Information Officer, Executive Officer for two agency directors, and as the Metro Highway Patrol...

Stacy Guillen serves as the director of Law and Policy and manages the operations for the following work groups: Government Relations Office, Executive Hearing Office, Risk Management and the Administrative Counsel. She serves as the chief legal counsel for the agency, acts as a liaison to the Office of the Attorney General, and confers with all levels of international, federal, state and local...