Stacy Guillen serves as the deputy 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 governments, and members of the public affected by ADOT. 

Before joining ADOT in 2015, Stacy previously served as the deputy general counsel for Governor Janice Brewer for two years, advising the governor and her staff on a variety of issues while managing the day-to-day activities of the legal staff. She was the rules attorney and ethics counsel for the Arizona State Senate and staff attorney for the Arizona House of Representatives over a six-year period from 2007 to 2013.

Stacy received her juris doctor in 2007 from the Sandra Day O’Connor College of Law at Arizona State University and was admitted to the Arizona State Bar in 2007. She earned a bachelor of arts degree in journalism with a minor in business administration from Arizona State University.

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 divisions.  Teresa also served ADOT from 2006 – 2014 as Statewide Public Involvement Director, Assistant Communication Director and Partnering Administrator.

Teresa holds a Bachelor of Science in Business Administration degree in Finance from The University of Arizona and a Masters of Education in Educational Leadership from Northern Arizona University.

Greg Byres serves as deputy director/ state engineer for transportation. Supervising the Infrastructure Delivery and Operations Division (IDO) and the Multimodal Transportation Division (MPD), he leads development and delivery of the ADOT construction program, including environmental studies, engineering design, land acquisition and construction. He also supports the maintenance and operation of more than 6,000 miles of interstate and state highways in Arizona.

Greg joined ADOT in 2015, having served as a senior project manager, State Roadway Engineer and as Director of the Multimodal Planning Division.

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 director, she oversaw all aspects of department operations, including the accounting and processing of the state’s more than 5 million tax documents and $12 billion in tax revenue. Before joining DOR, Kristine served three administrations—Governors Symington, Hull and Napolitano—in the Office of Strategic Planning and Budgeting (OSPB) in various roles, including director and deputy director. At OSPB, she oversaw and coordinated more than 120 state agency budgets, totaling $20.6 billion, and represented the governor in budget matters.

Kristine holds a bachelor's degree in business with a concentration in finance from Bowie State University and a master’s degree in public administration from Arizona State University

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 and the Office of Safety. Floyd also works with Arizona’s metropolitan planning organizations, councils of government, the Federal Highway Administration and other stakeholders.

Floyd served as deputy director for policy from 2011-2015. Floyd also served as state engineer from 2008 to 2011. He has nearly 40 years of engineering experience, more than 30 of which with ADOT in Roadway Engineering, Statewide Project Management, Valley Project Management Group, State Engineer and Director’s Office.

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 Bureau Commander, overseeing Highway Patrol, Motors, Commercial Motors Vehicles and the Capital District. Wayde also held roles in Special Investigations, and from 2016-2019 was appointed assistant director overseeing the Agency Support Division and later the Highway Patrol Division. In his last assignment at DPS, Wayde served as a major in the Technical Services Division.

Wayde holds a bachelor degree from Wayland Baptist University and a Certified Public Manager certificate from Arizona State University. He is also a graduate of the Harvard Kennedy School’s Senior Executives in State and Local Government and Northwestern University’s School of Police Staff and Command.