Former Executive Director of the America Petroleum Institute of South Carolina
Former Vice President of Government Affairs and Public Policy for the South Carolina Chamber of Commerce
Mark Harmon joined Cornerstone in December of 2024, expanding the firm's South Carolina office and solidifying our southern reach and capabilities.
Prior to joining Cornerstone, Mark served as Principal at The Harmon Consulting Group, LLC, where he provided contractual lobbying and consulting services by representing multiple clients before the legislative and executive branches of the South Carolina state government. Previously, Mark worked at Maynard Nexsen, PC, formerly Nexsen Pruet, LLC, as Government Affairs Advisor, also providing contractual lobbying and consulting services at the state level.
Before shifting to contract lobbying and consulting, Mark served as Executive Director of the America Petroleum Institute of South Carolina, advocating on behalf of the oil and natural gas industry before the state and federal government. In this role, he also coordinated with state agencies to ensure oil and natural gas operators were able to get products into high-demand areas during hurricanes and natural disasters. Additionally, Mark cultivated relationships with several of the state's Historically Black Colleges and Universities to promote STEM opportunities in oil and gas.
Prior to his work with the American Petroleum Institute, Mark served as the Vice President of Government Affairs and Public Policy for the South Carolina Chamber of Commerce. Harmon represented the state's business community and led an internal team responsible for generating the Chamber's public policy agenda, implementation strategy and social media outreach.
Before his time with the Chamber of Commerce, Mark served as the Executive Director of the South Carolina Senate Republican Caucus, where he organized campaigns, led ethics compliance and financial accounting and acted as liaison between Caucus supporters and senators to ensure all parties' interests were represented. As part of this role, Mark served as the day-to-day policy advisor to Senate Republican Caucus members and organized legislative session events and annual retreats for members and contributors. During his tenure, the Caucus gained seats and expanded its majority.
Mark received his Bachelor of Science in Ceramic and Materials Engineering from Clemson University.
(850) 222-8900
204 S Monroe St, Tallahassee, FL, 32301,
1) AAR Corp
3) Alliance for Commercial Real Estate
5) Altria Client Services LLC and its Affiliates
6) Anheuser-Busch Companies, LLC
7) AppleOne Employment Services | All's Well Health Care Services
8) Armis, Inc
9) Associated Industries of Florida
10) AT&T
11) Binti, Inc.
12) BlueGreen US Water Technologies, INC
13) BlueVoyant
15) Brooksville RX
16) CDS Housing
17) Centene Corporation on behalf of its affiliates and subsidiaries
18) Centennial Management Corp.
19) Central Florida Gaming, LLC
21) CHSPSC, LLC
22) Citrus County Board of County Commissioners
23) City of Ocala
24) Classic Learning Initiatives LLC
26) Cleveland Clinic Florida Health System Nonprofit Corporation
30) Endeavors
31) Environmental Defense Fund
32) Everglades Glades College Inc. dba Keiser University
33) Exelerate Smart Traffic LTD
34) FEI Systems
36) Florida Alliance for Seniors
37) Florida Carpenters Regional Council
38) Florida Hospital Association
41) Jabil Inc
43) JetBlue Airways Corporation
44) Kaseware
46) LeadsOnline, LLC
47) Lee County Board of County Commissioners
48) LivaNova, PLC
49) Marriott International, Inc
50) Medallion Home
52) MIS Security
54) Okaloosa County Board of County Commissioners
56) Palladium Investment Partners, LLC
57) Pasco County Board of County Commissioners
58) PayIt, LLC
62) QuickMD LLC
64) Reinsurance Association of America
65) RIDA Realty Investments Corporation
66) Rising Phoenix Holdings Company
67) RSM US LLP
68) Rubrik, Inc.
69) SediVision
75) TechNet
76) TECO Energy, Inc
77) U.S. Submergent Technologies, LLC
78) VSP Vision Inc. c/o MultiState Associates
79) Waymo LLC
81) Workday
82) WW Grainger Inc
8033315075
1520 Main St Unit 2B, Columbia, SC, 29201,
2) Equifax Inc.
303-519-5562
1660 Lincoln Street, Suite 2125, Denver, CO, 80264,
1) Alliance for Pharmacy Compounding
7) Colorado Soccer Association
9) CommuniCare Technology Inc.
10) Cornerstone Government Affairs
11) CRH Americas
13) Epiq Global
14) Generation Schools Network
15) GHGSat Inc.
18) Intuit
20) MxV Rail
21) National Parking Association
22) Neighborhood Development Collaborative
24) Recsol Recovery Solutions, LLC
25) Rocky Mountain Human Services
26) Sheet Metal and Air Conditioning Contractors' National Association Colorado Chapter
27) Slalom, Inc.
28) Solari
29) Southern Farm Bureau Casualty Insurance Company
30) Spectra Centers
720-626-4475
1660 Lincoln Street, Suite 2125, Denver, CO, 80238,
1) Alliance for Pharmacy Compounding
7) Colorado Soccer Association
8) Communicare
9) Cornerstone Government Affairs
10) CRH Americas
12) Epiq Global
13) Generation Schools Network
14) GHGSat Inc.
17) Intuit
18) Land O Lakes
19) MxV Rail
20) National Parking Association
21) Neighborhood Development Collaborative
23) Recsol Recovery Solutions, LLC
24) Rocky Mountain Human Services
25) Sheet Metal and Air Conditioning Contractors National Association-Colorado
26) Slalom, Inc.
27) Solari
28) Southern Farm Bureau Casualty Insurance Company
29) Spectra Centers
720-427-4120
1660 Lincoln St., Suite 2125, Denver, CO, 80264,
1) Alliance for Pharmacy Compounding
7) Colorado Soccer Association
8) CommuniCare Technology, Inc.
9) Cornerstone Government Affairs
10) CRH Americas
12) Epiq
13) Generation Schools Network
14) GHGSat Inc.
18) Intuit
20) MxV Rail
21) National Insurance Crime Bureau
22) National Parking Association
23) Neighborhood Development Collaborative
25) Recsol Recovery Solutions, LLC
26) Rocky Mountain Human Services
27) Sheet Metal and Air Conditioning Contractors' National Association Colorado Chapter
28) Slalom, Inc.
29) Solari Inc.
30) Southern Farm Bureau Casualty Insurance Company
31) Spectra Centers
(704) 994-3200
220 Lions Gate Drive, Cary, NC, 27518,
(850) 222-8900
204 S Monroe Street, Tallahassee, FL, 32301,
2) Anheuser-Busch Companies, Inc
3) AppleOne Employment Services | All's Well Health Care Services
4) Associated Industries of Florida
5) AT&T
8) CDS Housing
9) Citrus County Board of County Commissioners
10) Elevance Health, and its Affiliates
11) Endeavors
12) Environmental Defense Fund
14) Florida Hospital Association
21) Lee County Board of County Commissioners
22) LivaNova, PLC
23) Marriott International, Inc
24) My3Tech
26) Pasco County Board of County Commissioners
27) PayIt, LLC
30) Reinsurance Association of America
31) RIDA Realty Investments Corporation
35) TechNet
36) TECO Energy, Inc
37) VSP Vision Inc. c/o MultiState Associates
38) Walt Disney Parks and Resorts, U.S.
39) Waymo LLC
(850) 222-8900
204 South Monroe Street, 125L, Tallahassee, FL, 32399,
(915)2271902
11900 Jollyville Rd, PMB No. 203832, Austin, TX, 78720,
914-255-0968
1660 Lincoln Street, Suite 2125, Denver, CO, 80264,
1) Alliance for Pharmacy Compounding
7) Colorado Soccer Association
8) CommuniCare Technology Inc.
9) Cornerstone Government Affairs
10) CRH Americas
12) Epiq Global
13) Generation Schools Network
14) GHGSat Inc.
17) Intuit
19) MxV Rail
20) National Parking Association
21) Neighborhood Development Collaborative
23) Recsol Recovery Solutions, LLC
24) Rocky Mountain Human Services
25) Sheet Metal and Air Conditioning Contractors' National Assoication Colorado Chapter
26) Slalom, Inc.
27) Solari
28) Southern Farm Bureau Casualty Insurance Company
29) Spectra Centers
(850) 222-8900
204 South Monroe St, Tallahassee, Florida, 32301,
2) Anheuser-Busch Companies, LLC
3) Associated Industries of Florida
5) Binti, Inc.
6) BlueGreen US Water Technologies, INC
8) Central Florida Gaming, LLC
9) Everglades Glades College Inc. dba Keiser University
12) Independent Colleges & Universities of Florida, Inc
13) Jabil Inc