MDOT Executive Leadership

Transportation Acting Secretary Katie Thomson

Governor Wes Moore appointed Kathryn “Katie” Thomson as acting secretary of the Maryland Department of Transportation on December 18, 2025.

Acting Secretary Thomson brings more than 30 years of experience in transportation, aviation, energy, and sustainability law, policy, and operations to the role. She most recently served as deputy administrator of the Federal Aviation Administration, where she acted as chief operating officer for an organization of more than 45,000 employees. In that role, she oversaw a $20 billion annual budget and led initiatives to enhance safety oversight, modernize national airspace infrastructure, and strengthen workforce pipelines.

A veteran of the U.S. Department of Transportation, Acting Secretary Thomson previously served as the department’s general counsel, where she supervised 500 attorneys and coordinated legal work across all modes of transportation. She also served as the director of the Bipartisan Infrastructure Law’s implementation, managing the strategic investment of $660 billion in federal funding to modernize the nation’s infrastructure.

In the private sector, Acting Secretary Thomson served as vice president and associate general counsel for worldwide transportation and sustainability at Amazon, leading the legal team supporting global logistics and the company’s climate commitments. Her career also includes serving as a partner at the law firms Sidley Austin and Morrison & Foerster, with a focus on environmental and transportation law.

Acting Secretary Thomson earned her bachelor’s degree from the University of Illinois and her law degree from the University of Pennsylvania Law School.

Deputy Secretary Samantha J. Biddle

Samantha J. Biddle has served as the Deputy Transportation Secretary since 2023. During that time, she also served as Acting Secretary from August 2025 until mid-December 2025 following the departure of then-Secretary Paul J. Wiedefeld. Deputy Secretary Biddle has spent nearly two decades in the transportation industry, serving in both the public and private sector.

As Deputy Secretary, she serves as a member of the Secretary’s cabinet and as the primary liaison to the Governor’s office, leading on policy and operational matters to ensure the successful management of the Maryland Department of Transportation’s (MDOT) Secretary’s Office and six transportation modes spanning transit, highways, airport, port, tolling and motor vehicle services. In this role, she coordinates with internal and external stakeholders on project and policy matters including development and review of state and federal legislation, economic development opportunities, and innovative funding pursuits; oversees development of capital and operating budgets and corresponding stakeholder messaging; monitors and supports the major infrastructure profile of MDOT; and creates a people-based, department-wide narrative strategy focused on safety, positive return on investments, delivery and innovation.

Deputy Secretary Biddle joined state service in 2014, beginning as the State Highway Administration’s (SHA) Regional Planner for Frederick and Montgomery Counties. She was then promoted to Assistant Chief and Chief of Regional and Intermodal Planning, and Director of Organizational Excellence and Strategy. Following her time at SHA, she was selected to serve as Chief Strategy Officer within The Secretary’s Office and then advanced further to serve as Chief of Staff.

Deputy Secretary Biddle holds a bachelor’s degree in geography from the University of Delaware and is an American Institute Certified Planner (AICP). She also completed the American Association of State Highway and Transportation Officials (AASHTO) Executive Institute and SHA Advanced Leadership Program. She serves as Maryland’s voting member for AASHTO’s Transportation Policy Forum, Chair of the AASHTO Census Transportation Solutions (ACTS) technical service program, is a Director-At-Large for Women’s Transportation Seminar (WTS) – Baltimore Chapter and serves as a Young Professionals Program Mentor. She was named one of the Daily Record’s Maryland Top 100 Women for 2024 and named WTS Baltimore’s Woman of the Year in 2024. Prior to joining SHA, Deputy Secretary Biddle worked in the private sector as an Associate Transportation Planner with JMT Engineering for eight years.

Deputy Secretary Biddle lives in Carroll County with her two daughters, husband, and dog. She is a lifelong field hockey player, participating regularly in both local leagues and the U.S. Women’s Masters Team.

Jawauna Greene

Assistant Secretary for Public Affairs and Strategy

With a transportation career spanning more than 20 years, Jawauna has held numerous public sector roles. She formerly worked at the Maryland Port Administration as a legislative liaison and then the Maryland Transit Administration as the Director of Communications and Marketing. After leaving MDOT, Jawauna served as the Director of Advertising and Marketing at the Washington Metropolitan Area Transit Authority (WMATA). Prior to joining MDOT, she was the Director of Branding and Customer Partnerships for the Port Authority of New York and New Jersey. Jawauna has a bachelor’s degree in political science from Hood College and a master’s degree in business administration from the University of Maryland.

Jaclyn Hartman

Assistant Secretary for Transportation Investments

Most recently serving as MDOT’s Chief Financial Officer and Director of the Office of Public-Private Partnerships, Secretary Wiedefeld named Jaclyn as the new Assistant Secretary for Transportation Investments. Jaclyn has extensive knowledge in these areas as well as the ability to develop creative solutions to solve fiscal issues. Prior to joining MDOT, Jaclyn worked for the Maryland Transportation Authority and the Department of Legislative Services. During her career, she has worked on both the legislative and executive branch sides of Maryland’s P3 projects and served as committee staff for the Joint Legislative and Executive Commission on Oversight of Public-Private Partnerships, which created Maryland’s statutory framework for P3s. Jaclyn has a bachelor’s degree in political science from Elon University and a master’s degree in public policy from the University of Maryland.

Joe McAndrew

Assistant Secretary for Project Development and Delivery

Joe joins MDOT after serving as Vice President of Government Affairs and Infrastructure for the Greater Washington Partnership. In this role, he led the Partnership’s policy and engagement work with federal, state and local elected officials, and led efforts to achieve a 21st century regional mobility and infrastructure ecosystem in the Capital Region. Prior to joining the Partnership, Joe served as legislative assistant for the Senate Commerce Committee and Senator Brian Schatz. Before working on Capitol Hill, he served as the Policy Director for Transportation for America. Joe holds a bachelor’s degree in management from Luther College and a master’s degree in community and regional planning from the University of Oregon.

Dianna Rosborough

Assistant Secretary for Administration

Prior to joining MDOT, Dianna served as Executive Vice President of Internal Business Operations (IBOP) for the Washington Metropolitan Area Transit Authority (WMATA). She also held positions as Vice President of IBOP Administration and Operations, Acting Vice President and Chief Labor Relations Officer, and Director of Labor Relations. Prior to joining WMATA, Dianna was Regional Vice President of Marketing for Anthem Healthcare and Company Founder of Rosborough Communications, Inc. Her experience in state government includes serving as Deputy Administrator of the Maryland Transit Administration, the Governor's Press Secretary and Director of Communications for the Maryland Transit Administration.