11-15 years

20+ years

Ross Giesinger brings over a decade of legislative experience at the Texas Capitol to the Cornerstone team, having served for six legislative sessions in both the Texas House and Senate.

Most recently, Ross worked as a policy advisor to Dade Phelan, Speaker of the Texas House, of Representatives, during the 87th Regular Session, where he assisted with the passage of over 80 pieces of legislation. Additionally, Ross drafted and managed several bills filed in response to Winter Storm Uri, including SB 3, one of the most comprehensive energy reforms in Texas in the last 20 years.

Prior to his time in the House, Ross spent several years working as general counsel and legislative director for Sen. Lois Kolkhorst (R-TX) and as the director of the Senate Committee on Health and Human Services. While at the Senate, Ross assisted with the passage of nearly 300 bills and worked to obtain funds for a variety of initiatives, including legislation that secured permanent funding for Texas State Parks.

Ross began his career at the legislature in 2010 as a drafting attorney for the Texas Legislative Council. During his time with the state, he has drafted thousands of pieces of legislation, allowing him to develop expertise in a wide variety of subject areas, including energy, healthcare, water, land use and development, transportation, insurance, labor, agriculture, wildlife, taxation, and state budgeting.

Ross is a graduate of the University of Texas at Austin and Southern Methodist University's Dedman School of Law. He is a member of the Austin Young Lawyers Association and was recently elected to serve on the Council of the Texas State Bar's Legislative and Campaign Law Section. Ross also serves as a Steward of the Wild for the Texas Parks and Wildlife Department and has been active in the Austin Ballet Guild, the Trail Foundation, and CCA. He and his wife Courtney live in Austin with their young son Henry.

0-5 years

Annabelle Sebesta joined the Austin office as a Senior Associate in October 2022. In her role, she assists with administrative and support duties, scheduling meetings and organizing annual events and legislative receptions. Additionally, during the legislative sessions, she provides extensive support to the team by following legislation and keeping the team up to date with information.

Prior to Cornerstone, Annabelle served as Administrative Coordinator at the Office of the Texas Speaker. In this role, she assisted senior staff with correspondence, resource navigation, special property and supply requests. In the same office, Annabelle was a Correspondence Assistant, where she drafted correspondence by researching legislation and maintained data entry for incoming and outgoing communication. She also assisted the director of administration with onboarding the 87th regular legislative session intern class and new staff members of the office, as well as the production of special events.

Annabelle received her bachelor's degree in advertising from the University of Texas Austin.

6-10 years

2019 Capitol Inside Texas Lobby Power Rankings - "Rising Star"

Texas Legislature
Texas Governor's Office
Texas Commission on Environmental Quality
Texas Comptroller of Public Accounts
Public Utility Commission of Texas
Railroad Commission of Texas
Texas Water Development Board
Texas Department of Transportation
Texas Department of Agriculture
Texas Alcoholic Beverage Commission
Texas Parks and Wildlife Department
Texas Animal Health Commission
Texas Department of Insurance
Texas Facilities Commission
Texas Health and Human Services Commission
Texas General Land Office
Texas Department of Licensing and Regulation
Texas Department of Public Safety

Matthew Bentley is a government relations consultant working for associations, companies, local governments and non-profit organizations in Texas. His practice is focused on environmental management, energy and utility regulations, private property interests, natural resources, infrastructure projects, economic development and alcohol issues. Matthew focuses his guidance on public positioning, issue management and government relations. His success relies greatly on his extensive relationships with elected officials and staff throughout the legislative and executive branches of state government. His work has resulted in the development and implementation of public policy; formulation of strategy with key government officials; and improved communication between legislative and business leaders at the highest level.

Matthew began independent lobbying during the 83rd Legislative Session (2013). Among others, he currently represents the country's largest telecommunications company, the state's leading utility association, a mining operation, a Class A water utility, a conservative tort reform organization, a multi-national transportation infrastructure company, a mid-sized manufacturer seeking regulatory rule changes, an association involved with the Texas Sunset Advisory Commission, a group of Texas wineries, a residential developer and a non-profit cancer research foundation. Previous clients have included the state's two largest waste and recycling businesses, several landowner groups, an oil and gas trade association, special purpose districts, a leading power generation company and other major infrastructure projects. Matthew was recently named a Top Ten "Rising Star" by Capitol Inside, a bi-partisan publication covering Texas politics and government.

Throughout the 82nd Texas Legislature (2011), Matthew was under contract to Reggie Bashur, Cliff Johnson, Clay Pope and Luis Saenz, working on their clients' interests before the Texas Legislature and agencies throughout the state. During the 81st Legislative Session (2009), he worked for Commissioner Todd Staples at the Texas Department of Agriculture, as the Commission underwent the Sunset Advisory Commission review process.

Matthew also previously served as Business Development Manager for Procurement Strategy Group, Inc. This Austin-based government relations firm was well respected by government and business leaders for brokering mutually beneficial procurement solutions, until it dissolved due to retiring partners in 2012. Matthew helped companies target and win projects with federal, state and local governments.

Matthew has considerable experience and great success in working on political campaigns throughout Texas and the United States. In 2018, Matthew had a one hundred percent win rate as he consulted on Cody Harris' campaign for the Texas House of Representatives, U.S. Congressman Lance Gooden's open seat race for Congress and judicial races throughout East Texas. Matthew also served as Campaign Manager for State Representative Byron's Cook successful 2016 campaign for re-election. That race was among the highest profile and most seriously contested races that cycle. Matthew started his campaign work with Commissioner Todd Staples' statewide Agriculture Commissioner campaign and Governor Rick Perry's 2010 gubernatorial and 2012 presidential races. Matthew is very involved with the Texas GOP's Mighty Texas Strike Force, having served as the Virginia Co-Captain for the 2016 General Election.

Matthew presently serves on the Advisory Council for Texan by Nature, a non-profit organization founded by Former First Lady, Laura Bush, which focuses on safeguarding the environment with respect to private property interests and economic development. Matthew graduated from The University of Texas at Austin.

20+ years

Previously, McGarah served as the Committee Director of the powerful Senate Natural Resources Committee. During her 10 years with this committee she established solid relationships with key members of the legislature and various environmental agencies, and developed a thorough knowledge of Texas' air, water, and waste issues.

McGarah dedicated countless hours to the preparation and passage of groundbreaking pieces of legislation, including Senate Bill 1 in 1997 and Senate Bill 2 in 2001. Both of these bills dealt with state water management measures and greatly impacted the state.

McGarah was also instrumental in the development and passage of SB 5 in the 75th Legislature, which created the Texas Emissions Reduction Program. This program has served as a model for numerous other states across the country, and has been a vital component in assisting Texas meet the Federal Air Quality Standards.

20+ years

With decades worth of hands-on experience in Texas government and politics, Sabrina Brown offers valuable strategic counsel, as well as access to a vast network of key associates and decision-makers to a broad spectrum of clients.

Brown's extensive expertise in the state's legislative, regulatory, public affairs and appropriations arenas - combined with her strong bipartisan relationships - provides businesses and organizations with vital political and governmental guidance. Utilizing her many contacts within the Texas House and Senate, Executive Office and state agencies, Sabrina has effectively achieved the public policy goals of a wide variety of clients, from aeronautics giants to groundwater districts to Fortune 100 companies.

Prior to opening her own consulting firm, Sabrina was a highly successful lobbyist for an Austin-based law firm, and previously spent a half-dozen years at the Capitol working for the Texas House of Representatives. Her first-hand experience has given her a detailed familiarity with the legislative process and an in-depth understanding of state lawmakers' perspectives. With these insights, Sabrina creates effective messages and uses her firm's resources to efficiently communicate a client's position to busy legislators.

Brown earned her Masters in Public Affairs at the Lyndon B. Johnson School of Public Affairs at The University of Texas, and her bachelor's degree at Texas A&M University.

Brown currently serves on the boards of Dell Children's Medical Center Foundation, West Austin Youth Association, Beyond Batten Disease Foundation, Friends of the Governor's Mansion, Texas Conference for Women, and the Seton Development Board.

Martin Hubert brings a wealth of state government experience to the clients of Cornerstone Government Affairs. From his early career as chief counsel to the Senate Natural Resources Committee to his gubernatorial appointment as a commissioner of the Texas Commission on Environmental Quality to his eight years as the deputy comptroller of Texas, Hubert has managed thousands of employees and millions of taxpayer dollars under both Democrat and Republican administrations.

Martin was the 2008 recipient of TSABAA's Administrator of the Year Award. Presented annually, this prestigious award was established to formally recognize state employees who have demonstrated outstanding leadership skills and who have made significant contributions to state agency business administration.

As the final general counsel to legendary Lt. Governor Bob Bullock, Martin learned the mastery of government relations from some of the most influential leaders in Texas history. His knowledge of agriculture stems from generations of the Hubert family's cow/calf and farming operations in South Texas and serving as the Texas Deputy Commissioner of Agriculture for eight years. Martin offers a unique combination of legal, natural resources, tax policy and state government procedural expertise.

Hubert is a graduate of the Georgetown University Law Center and St. Mary's School of Law. He was Brigade Executive Officer in the Corps of Cadets at Texas A&M University, where he was a member of the Ross Volunteers Honor Guard and the Singing Cadets. He successfully completed Army Ranger School and served in the U.S. Army Reserves. He is a marathon runner and coaches his son's little league teams.

Hubert is a second tenor and helps raise money for Legal Aid through the Travis County Bar Association's "Bar and Grill" fundraisers. He and his wife Celeste live in a historic home in Austin, where they are involved with the Austin Symphony, St. Theresa's Catholic Church and School, and the happily busy lives of their children Belle and Patrick.

Max Moll joined the Cornerstone Public Affairs team April of 2023, bringing a public affairs and strategic communications presence to Cornerstone's Texas offices. In his previous role as chief engagement officer at the Houston Independent School District, he oversaw government relations, communications, family and community engagement and board relations for the nation's eighth largest school district. He also oversaw the district's legislative affairs work and external lobby team, ensuring alignment and execution of district's legislative priorities. In addition, he represented the district with external stakeholders, in traditional and digital media appearances, and on panels and other various speaking opportunities. He was also the lead spokesperson for the district and main point of contact for elected officials, advocacy groups and private industry.

Prior to working at HISD, Max served as the chief communications officer & deputy director for the Office of the Houston City Controller, Chris B. Brown. He spearheaded all communications initiatives for the Office of the City Controller, working across the City of Houston's 22 departments to help unify external and internal communications. Max served as liaison between Controller's Office and the city's investors, developing key external messaging relating to investment strategy, portfolio performance, and maintaining key relationships with city's investor base. In addition, and in partnership with the Controller's Office Treasury Division, Max helped oversee the city's Environmental, Social, and Governance (ESG) investments, helping grow the portfolio to over $950 million.

Max also served as the chief of staff to the CEO of the Houston Hispanic Chamber of Commerce, where he oversaw the development and execution of the Chamber's public affairs and community outreach efforts, legislative advocacy campaigns and external affairs projects. Also, he served as the main point of contact for media, securing comprehensive coverage and managing all media relationships on behalf of the Chamber and its members.

He holds a master's in business administration from Boston University, master's in political management from George Washington University, and a bachelor's in mass communication from LSU.

Tony Essalih joined Cornerstone in 2011 as a co-lead of the firm's flagship Texas office in Houston. He spent 12 years on Capitol Hill and came to Cornerstone from the office of Congressman John Culberson (R-Houston). Tony worked for Congressman Culberson for 10 years, the last five as his chief of staff. Prior to becoming chief of staff, Tony served in a variety of capacities including legislative assistant, legislative director, communications director, and deputy chief of staff. He spent eight years in Washington, D.C. before relocating to Houston in 2007.

As chief of staff, Tony was responsible for guiding the day-to-day operations of the Congressman's Washington and Houston offices, and oversaw a 15-member staff under a fixed budget. Outside of the office, he served as the principal liaison to the Congressman's campaign committee and provided strategic counsel and advice related to his re-election efforts. Tony's areas of policy expertise include transportation, energy, budget and appropriations. Tony also led outreach efforts and served as an emissary on behalf of the Congressman with state lawmakers in Austin and local elected officials in Houston.

Prior to Culberson's election in 2001, Tony worked as a legislative assistant for Congressman Culberson's predecessor, former House Ways and Means Committee Chairman Bill Archer. Tony's began his tenure on Capitol Hill with former House Natural Resources Committee Chairman Doc Hastings.

Tony has advised and assisted numerous local, state, and federal campaigns. He serves on the board of the National InterFaith Foundation, the Advisory Board for the Houston Technology Center, spent two years on the Board of the Spring Branch Medical Center and was a member of Houston Mayor Annise Parker's transition team in 2010.

Tony was born and raised in Fredericksburg, VA and received his B.A. in Political Science from Mary Washington College. He was a member of Mary Washington's NCAA semifinalist men's soccer team. He lives in Houston and has two angelic daughters, Grace and Libby.

Justin R. Jordan is an award-winning political advisor and a vice president at Cornerstone Government Affairs. Justin specializes in federal and state government relations, and communications.

For more than 14 years, Justin has been involved in guiding congressional, state legislature, judicial, mayoral, city council, county executive and school board campaigns and advising clients and elected officials. His unique background offers his clients an integrated approach to solutions that help them navigate the political arena. In addition to his work with a range of Cornerstone clients in the state of Texas, he also has experience working on behalf of foreign governments.

Prior to joining Cornerstone, Justin founded Patriot Group Strategies, a consulting firm specializing in strategy, marketing and fundraising. Over the years, he developed a niche of reaching constituency's through the use of unconventional and innovative communication strategies. His entrepreneurial know-how positions him as a national leader in providing strategic advice in an array of political issues including, but not limited to diplomatic relations, pensions, and cyber security.

He has served as a deputy field coordinator for the National Republican Congressional Committee, chairman of the Texas Federation of College Republicans and Executive Director for the watchdog organization, Texans for Ethics and Accountability.

Justin is a member of the Houston Airport System Development Corporation.

20+ years

In 2017, Governor-elect Phil Murphy selected Eric to serve on the Human Services Committee for his transition team. During that same year, he was nominated by Kentucky State Senator Jimmy Higdon and commissioned by Kentucky Governor Matt Bevin to become a Kentucky Colonel.

In 2004, Eric was nominated by New Jersey Governor Jim McGreevey to serve on the South Jersey Port Corporation's Board of Directors, which is responsible for the development of port facilities in South New Jersey. Eric was reappointed in 2008 by Governor Corzine and again in 2017 by Governor Chris Christie.

In 2018, Eric was appointed to the Advisory Board of the Burbank International Film Festival.

Eric is also a founding member of the Board of Directors for the NYC Fashion Manufactures Alliance of Design Educators and Save the Garment Center in New York City; a position he's held since 2008.

In 2007, Eric was selected by the American Council of Young Political Leaders, a bi-partisan not-for-profit international exchange organization, as a delegate to Vietnam for a two-week political exchange program. Eric joined six other young political leaders from the U.S. to study Vietnam's political system, engage in dialogue on international issues, and forge professional relationships. He's also participated in international trade missions, including trips to the Netherlands, China and the United Arab Emirates.

Eric was appointed in 2007 by New Jersey Governor Jon Corzine to serve as a member of the Economic Growth Council to assist with statewide economic development policies.

Eric is a former Committee Chairman for the Mercer County College Board of Trustees Advisory Committee and a former member of the Board of Trustees for the Arts & Business Partnership of Southern New Jersey. He's served on the boards of the Mercer County Workforce Investment Board, the Mercer County Economic Development Committee and Junior Achievement. Eric was appointed by Assembly Majority Leader Paul DiGaetano in 2002 to the New Jersey Council of Local Mandates and served as Vice Chairman until 2004.

Craig Holzheauser brings to Cornerstone years of involvement in Texas state and local politics. The son of a state representative, Craig went to work in the private sector after college before beginning a political career at the state capitol in 2012.

Working as a legislative consultant, managing the campaigns of House and Senate members, and serving as legislative director and then committee director of the House Committee on Public Health in his first year of employment, Craig is goal oriented and proven himself to be a quick study. Craig has a keen political intuition and a knack for developing the type of relationships that matter in campaigns, service of an elected official, or success for his clients.

A native of Victoria, Texas, Craig holds a Bachelor of Science in Construction Science from Texas A&M University.

15-20 years