Juris Doctorate and Master's in Business Administration from the University of Memphis.

Tennessee Bureau of Investigation, Tennessee Department of Children's Services, Tennessee District Attorneys General Conference

Zoe Sams is a Principal at Stones River Group, where she serves as a trusted advisor on government relations, public policy strategy, and legislative advocacy. Zoe brings more than a decade of experience working across Tennessee state government, with deep expertise in legislative strategy, policy development, and coalition building. In her role at SRG, she helps clients understand and influence the public policy process, navigate complex political and regulatory landscapes, and advance strategic objectives before the General Assembly and state agencies.

Before joining Stones River Group, Zoe built a distinguished career in public service and government affairs:

• Deputy Director, Tennessee District Attorneys General Conference, where she led legislative agenda development, managed agency budgeting, and coordinated with coalition partners to secure legislative outcomes.


• Director of Legislation, Tennessee Department of Children's Services, advancing policy priorities and legislative engagement for a major state agency.


• Assistant General Counsel and Legislative Liaison, Tennessee Bureau of Investigation, serving as the primary legislative contact and policy strategist for the agency


• Assistant District Attorney, where she prosecuted human trafficking cases and crimes against children and other vulnerable victims, grounding her advocacy in both legal acuity and deep personal commitment to public service.

She is known for her strong professional relationships with state officials and stakeholders across Tennessee and for translating complex policy and political dynamics into practical strategies that drive client success. Outside her professional work, Zoe serves on the board of Tennessee Voices for Victims, reflecting her ongoing commitment to public safety and community impact.

Tony Niknejad is a distinguished policy strategist and government relations expert, skilled in the areas of legislative advocacy, fiscal management, and strategic planning. Tony assists clients with navigating the Tennessee political landscape, orchestrating policy and legislative initiatives, and steering comprehensive advocacy and public engagement campaigns. From 2019 to 2023, he was the Policy Director for Tennessee Governor Bill Lee, serving as a key advisor and leader for the Governor's Cabinet and leading many of the Administration's major policy reforms. As policy director, Tony also played a critical role in Governor Lee's successful 2018 campaign and post-election transition. Tony spearheaded key policy initiatives across a wide span, specializing in education, workforce, tax and healthcare policy.

• He was a driving force behind multiple Administration legislative initiatives, including the Education Savings Account Act of 2019, the Literacy Success Act of 2021, the Tennessee Strong Families Initiative, and the Tennessee Works Tax Act of 2023.


• Tony also led federal and multi-state relations through the COVID pandemic, coordinating the Financial Stimulus Accountability Group, which managed the allocation of over $6 billion in federal funds received through the CARES and American Rescue Plan Acts.


• Prior to his work with Governor Lee, Tony served as state director for a school choice advocacy organization, overseeing Tennessee PAC activities and lobbying efforts from 2013 to 2017.


• Before that, he served as a legislative staffer in the Tennessee State Senate during the 107th General Assembly.


• Tony is a member of the State Bar of Tennessee and graduated from Vanderbilt University Law School in 2011. He received his bachelor's degree from the University of Georgia, where he double-majored in Economics and Philosophy. He was selected for the Harvard Business School Young American Leaders program, Nashville Class of 2019.

6-10 years

I have been recognized by the Nashville Post list of In-Charge: Government & Politics for 2019, 2020, 2021, and 2022

Our firm was recognized nationally by the Public Relations Society of America for our comprehensive public affairs campaign to bring Major League Soccer to Nashville

Mark Cate is the Founder and President of Stones River Group, a Nashville-based public affairs firm serving both Tennessee, regional and national clients. He formerly served as Tennessee Governor Bill Haslam's chief of staff, where he was his top advisor, strategist and negotiator.

During his tenure with the Haslam Administration, Mark led several legislative policy initiatives, including K-12 education reform, workers' compensation reform, civil service reform, an alternative approach to Medicaid expansion, and postsecondary education reform, including the nationally-acclaimed Tennessee Promise program.

Prior to serving in state government, Mark successfully managed Governor Haslam's first gubernatorial campaign in 2010, which led to a record-setting general election victory. He previously worked as an executive in real estate management and development and served for 16 years as a higher education leader. Over the course of his career, Mark has served as a chief development officer, chief planning officer, chief marketing officer, and as a chief financial officer—working on budgets ranging from $10 million to $30 billion.

Mark grew up in Maryville, TN and currently lives in Brentwood with his wife Cathy who serves as the Executive Director of Leadership Tennessee. He and Cathy have two daughters, Bailey who is a recent graduate at Rhodes College and currently serves as a fellow at the Crop Trust in Bonn, Germany; and Abbie who is rising junior at George Washington University.

Cate received a B.S from Carson-Newman College, an M.S from the University of Tennessee, and Harvard University's Institute for Educational Management certificate program. He's served on a wide variety of non-profit boards and was an elected member of the Maryville Board of Education.

6-10 years

Stephen Susano is the Co-Founder and COO of Stones River Group, a Nashville-based public affairs firm serving both Tennessee, regional and national clients. He provides clients with strategic counsel on business opportunities and project management, regulatory matters, procurement, economic development, third-party engagement, and market positioning. Stephen leverages his lengthy private-sector experience and deep network of relationships with business leaders and key policymakers in state and local government across Tennessee to deliver solutions for clients in multiple industries.

Prior to Stones River Group, Stephen served as Executive Director of the Tennessee Business Partnership (TBP), an advocacy organization supported by many of the state's leading enterprises. He spearheaded its efforts to advance pro-business policies, including education and judicial reforms, to encourage job growth and economic development. In 2014, Stephen led the statewide "Vote Yes on 2" campaign in support of the Judicial Selection Amendment to the Tennessee constitution. Stephen built a broad coalition of business groups, trade associations, legal advocates and community leaders in favor of the amendment. This coalition's successful mobilization helped ensure the amendment was approved with overwhelming support, carrying 94 out of 95 counties in Tennessee

Prior to working in the public affairs space, Stephen had an extensive career in the financial services industry. He served in operating and business development roles for several investment advisers and asset management firms. He has consulted with and raised capital for both U.S. and foreign-based investment firms, and has negotiated distribution and trading agreements with multiple financial services companies. Through his work, Stephen navigated complex regulatory regimes in domestic and offshore jurisdictions

Stephen grew up in Knoxville, Tennessee and currently lives in Brentwood with his wife, Ana. He and Ana have four children. Stephen serves on the board of the Nashville Downtown Partnership.