ACG Advocacy, LLC Adds Sean Byrne As A Partner

Sean Byrne Joins ACG Advocacy As A Partner

For Immediate Release: Monday, April 4, 2022
Contact: Jacqueline Juffer (202) 327-8100; [email protected]

(WASHINGTON, D.C.) – ACG Advocacy, LLC is pleased to announce that Sean Byrne has joined the ACG team as a Partner. Sean joins ACG after a decade of working on Capitol Hill and Senate Leadership. Sean joins ACG from his position as senior advisor to Senate Majority Leader Charles E. Schumer.

Managing Partner and ACG founder Shawn Smeallie said, “We are lucky to have Sean join our team. He will continue to help us build out our critically important energy, agriculture, and natural resources policy practices, and his knowledge of Senate rules and process is unmatched. Sean is a great addition and a wonderful guy.” Additionally, Managing Partner Manus Cooney said of the new addition: “Sean will bring vibrancy and enthusiasm to our practice. His experience at the Majority Leader’s office will be invaluable to our clients.”

Mr. Byrne brings years of experience developing policy priorities and coordinating between the legislative and executive branches and other public and private stakeholders. He has devised strategies with outside groups and businesses throughout his career to achieve legislative success.

While working for Senate Leadership, he’s been responsible for a legislative portfolio including agriculture, environment, energy and natural resources, public land management, and NASA issues. During his tenure, he worked with Democratic and Republican Senators and staff as well as Administration officials to pass two farm bills, the Great American Outdoors Act, the 2018 omnibus wildfire funding fix, and multiple public lands and wildlife packages. He also negotiated sections of COVID relief legislation, numerous annual appropriations bills, and disaster supplemental packages.

Senior Partner Sheryl Cohen highlighted, “We are thrilled to have Sean Byrne join our group of seasoned professionals at ACG. Sean has deep experience in so many diverse areas, and he will add tremendous value for a whole host of clients.”

Mr. Byrne graduated from Miami University of Ohio in 2010 with degrees in Environmental Science and Urban Planning.


ACG Advocacy, LLC (ACG) is one of Washington’s premier bipartisan government affairs  firm, which also provides strategic consulting. Since 1994, ACG has been successfully advising Fortune Global 500 corporations, states, municipalities, and nonprofit organizations. Our principals have an unparalleled depth of both policy and political expertise, as well as breadth of government reach that allows us to tackle problems that few others can. At our core, we are passionate about finding innovative solutions to the biggest challenges and providing results for businesses, organizations, and people.

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