Our Staff


Seth Millican

Executive Director

Prior to joining the Georgia Transportation Alliance, Seth worked as Vice President of Public Affairs at Brock Clay Government and Public Affairs. He began his career working in various staff positions in the Georgia General Assembly. Seth earned his B.S. in Social Sciences from Thomas Edison State College. He’s married to his high school sweetheart, Kara, and they have three children: KJ, Eden Grace, and Gabriel. Seth loves Georgia sports teams, hunting, books and writing (on politics and culture), his faith, and his family.

Seth has been recognized in various publications for his work on behalf of political causes and policy related initiatives. He was appointed by Governor Nathan Deal to Chair the Georgia Athletic and Entertainment Commission and also serves on the board of the Georgia Wildlife Federation. He is also a founding member of the American Road and Transportation Builder’s Association Transportation Investment Advocacy Center, co-chair of the Council of State Chamber’s Transportation Committee, a member of the American Enterprise Institute’s Leadership Network, and a member of the U.S. Chamber’s Transportation Infrastructure and Logistics Committee


Maddison Hendershot

Senior Director of Operations

Maddison graduated with Honors from Samford University with a Bachelor’s Degree in Human Development and Family Life Education. After graduation, Maddison returned home to Atlanta and began her career. Maddison serves as the Senior Director of Operations for Georgia Transportation Alliance focusing on board engagement and events throughout the year.

Maddison married her college sweetheart, Nathan. They live in Cumming, GA, and attend Local Forsyth Church. Nathan and Maddison have a daughter named Ella Mae and a rescue puppy named Hoosier.


Allison Snellings

Director, Public Affairs

Allison Snellings started at the Georgia Chamber on the Public Affairs Team in July of 2018. Allison organizes events and communications for the Chamber’s Political Action Committee and Government Affairs Council. Prior to joining the Chamber, Allison coordinated political campaign fundraising efforts for Geoff Duncan for Lieutenant Governor. Before working on the campaign trail, Allison started her career in Washington, DC, serving as Staff Assistant & Press Assistant for US Congressman Austin Scott (GA-08).


Katie Duvall

Director, Government Affairs

Katie covers the issue areas of economic development and taxation, business and industry, and transportation for the Georgia Chamber government affairs team. Prior to joining the Chamber in June 2022, Katie spent more than six years at Georgia Farm Bureau where she served as Advocacy and Policy Development Coordinator. She began her career working in development at the University of Georgia and NC State University. An Athens native and lifelong Bulldog fan, Katie graduated from the University of Georgia with a B.S. in Agricultural Communication.

Today, Katie and her husband, Zeb, live on the family farm in Buckhead (Morgan County) with a few hundred cows and their dog, Piper.

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