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.
(815) 341-9564
45322 Byrd Rd, Albemarle, NC, 28001,
2023334936
601 Thirteenth Street, NW, Eleventh Floor South, Washington, DC, 20005,
2) AAPAN
4) Abiomed Inc.
5) Advanced Medical Technology Association
7) Airbus Americas Inc. (formerly Airbus Group)
10) ALG Senior LLC
11) Altimmune, Inc.
13) Amedisys, Inc.
14) American Beverage Association
15) American Health Care Association
16) American Society of Gene and Cell Therapy
17) Amgen Inc.
18) Ancestry
19) Asia Pacific Council of American Chambers of Commerce
20) Association of Dental Support Organizations
21) Aviator Capital Management, LLC
24) Biotechnology Innovation Organization
25) bluebird bio
26) Bluma Wellness / One Plant
27) Brightline Holdings LLC (formerly Virgin Trains USA)
28) Caesars Enterprise Services, LLC
29) Canadian National Railroad
34) Children's Hospital and Health System, Inc.
35) CJ America, Inc.
36) Cognizant Technology Solutions
39) Consumer Access to Repair (CAR) Coalition
41) Credit Suisse Securities (USA) LLC
43) CTIA
44) DisposeRx, Inc.
45) DuPage County
47) Eiger Biopharmaceuticals, Inc.
49) Embassy of the Kingdom of Bahrain to the United States
50) Embassy of the Republic of Azerbaijan
51) Enterprise Products Operating LLC
52) Entertainment Software Association
55) Flagstar Bank
60) Globe Specialty Metals, Inc.
61) Gramercy Funds Management, LLC
62) Greg Kelly
64) HNTB Corporation
65) Horizon Pharma
66) Huntington Ingalls Incorporated
75) MASS GENERAL BRIGHAM (FORMERLY KNOWN AS PARTNERS HEALTHCARE)
76) Massachusetts Mutual Life Insurance Company (MassMutual Financial Group)
78) Mattress Firm
80) Mid-Sized Bank Coalition of America
81) Motion Picture Association
82) National Association of Vision Care Plans
83) National Lifeline Association
85) NCTA-The Internet & Television Association
87) Neurocrine Biosciences, Inc.
88) Nord Stream 2 AG
89) North America's Building Trades Unions
92) Ontario Teachers' Pension Plan
93) Ouro Mining Inc.
94) Out of Home Advertising Association of America
95) Overseas Shipholding Group, Inc.
96) Pebble Limited Partnership
97) Pfizer, Inc
99) Pharma & Biopharma Outsourcing Association
100) Pharmaceutical Research and Manufacturers of America
101) Physicians for Fair Coverage
102) Piper Networks
103) Polaris Industries
104) Postmates Inc
106) Prudential Financial, Inc.
107) PTC Therapeutics
108) Quadrant Holdings
109) RAI Services Company
110) Raytheon Technologies Corporation and Affiliates (FKA United Technologies Corp)
111) Recess
112) Recro Pharma, Inc.
113) Republic of India
114) S&P Global
115) Samsung Electronics America
116) Sandvine
117) SAS Institute Inc.
118) Scotts Miracle-Gro Company
119) SCP-Health
120) Select Medical Corporation
121) Sellers Dorsey
122) Senior Care Pharmacy Coalition
123) Siemens Healthineers
124) Solix, Inc.
125) Southern Company Services, Inc.
126) SPIE
127) Stryker Corporation
128) The Assistance Fund
129) The College Board
130) The Optical Society
131) The Travelers Companies, Inc. and subsidiaries
132) Trust for the National Mall
133) U.S. Acute Care Solutions, LLC
134) U.S. Anesthesia Partners, Inc.
135) U.S. Global Leadership Campaign
136) University of Mississippi
137) Verizon Communications, Inc.
138) Vineyard Wind, LLC
139) Walgreen Co.
140) Water Utility, City of Waukesha
141) WE Energies
142) Western Digital Corporation
143) Wiregrass Economic Development Corporation
144) YRC Worldwide Inc.
145) Zogenix, Inc.
(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) C5MI
17) Caterpillar c/o MultiState Associates Inc.
18) CDS Housing
19) Centene Corporation on behalf of its affiliates and subsidiaries
20) Centennial Management Corp.
21) Central Florida Gaming, LLC
23) CHSPSC, LLC
24) Citrus County Board of County Commissioners
25) City of Ocala
26) Cleveland Clinic Florida Health System Nonprofit Corporation
29) Endeavors
30) Environmental Defense Fund
31) Everglades Glades College Inc. dba Keiser University
32) Exelerate Smart Traffic LTD
33) FEI Systems
35) Florida Alliance for Seniors
36) Florida Carpenters Regional Council
37) Florida Hospital Association
40) Jabil Inc
42) JetBlue Airways Corporation
43) Kaseware
44) LeadsOnline, LLC
46) Lee County Board of County Commissioners
47) LivaNova, PLC
48) Lottomatrix Corporation d/b/a Jackpot.com
49) Marriott International, Inc
50) Medallion Home
52) MIS Security
54) Okaloosa County Board of County Commissioners
55) OpenAI
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) TRHC TPA, LLC
78) U.S. Submergent Technologies, LLC
79) VSP Vision Inc. c/o MultiState Associates
80) Waymo LLC
83) Workday
84) 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) Adobe Inc.
2) Alliance for Pharmacy Compounding
5) Carbon Removal Co., Inc. dba Vaulted Deep
9) Colorado Soccer Association
10) Colorado WINS
11) CommuniCare Technology Inc.
12) Cornerstone Government Affairs
13) CRH Americas
15) Epiq Global
16) Generation Schools Network
17) GHGSat Inc.
20) Intuit
22) MxV Rail
23) Neighborhood Development Collaborative
24) Northwoods Consulting Partners, Inc.
25) Pano AI, Inc.
27) Recsol Recovery Solutions, LLC
28) Rocky Mountain Human Services
29) Sheet Metal and Air Conditioning Contractors' National Association Colorado Chapter
30) Solari
31) Southern Farm Bureau Casualty Insurance Company
32) Spectra Centers
720-626-4475
1660 Lincoln Street, Suite 2125, Denver, CO, 80238,
1) Adobe Inc.
2) Alliance for Pharmacy Compounding
5) Carbon Removal Co., Inc. dba Vaulted Deep
9) Colorado Soccer Association
10) Communicare
11) Cornerstone Government Affairs
12) CRH Americas
14) Epiq Global
15) Generation Schools Network
16) GHGSat Inc.
19) Intuit
20) Land O Lakes
21) MxV Rail
22) Neighborhood Development Collaborative
23) Northwoods Consulting Partners, Inc.
24) Pano AI, Inc.
26) Recsol Recovery Solutions, LLC
27) Rocky Mountain Human Services
28) Sheet Metal and Air Conditioning Contractors National Association-Colorado
29) Solari
30) Southern Farm Bureau Casualty Insurance Company
31) Spectra Centers
601 Thirteenth Street, NW, Eleventh Floor South, Washington, DC, 20005,
1) Airbus Americas Inc. (formerly Airbus Group)
2) American Beverage Association
3) Aviator Capital Management, LLC
5) Cognizant Technology Solutions
6) Consumer Access to Repair (CAR) Coalition
7) Credit Suisse Securities (USA) LLC
8) Enterprise Products Operating LLC
601 Thirteenth Street, NW, Eleventh Floor South, Washington, DC, 20005,
1) Airbus Americas Inc. (formerly Airbus Group)
4) Consumer Access to Repair (CAR) Coalition
5) CTIA
6) Embassy of the Republic of Azerbaijan
9) Globe Specialty Metals, Inc.
11) HNTB Corporation
720-427-4120
1660 Lincoln St., Suite 2125, Denver, CO, 80264,
1) Adobe Inc.
2) Alliance for Pharmacy Compounding
5) Carbon Removal Co., Inc. dba Vaulted Deep
9) Colorado Soccer Association
10) CommuniCare Technology, Inc.
11) Cornerstone Government Affairs
12) CRH Americas
14) Epiq
15) Generation Schools Network
16) GHGSat Inc.
20) Intuit
22) MxV Rail
23) National Insurance Crime Bureau
24) Neighborhood Development Collaborative
25) Northwoods Consulting Partners, Inc.
26) Pano AI, Inc.
28) Recsol Recovery Solutions, LLC
29) Rocky Mountain Human Services
30) Sheet Metal and Air Conditioning Contractors' National Association Colorado Chapter
31) Solari Inc.
32) Southern Farm Bureau Casualty Insurance Company
33) Spectra Centers
601 Thirteenth Street, NW, Eleventh Floor South, Washington, DC, 20005,
4) American Beverage Association
6) Brightline Holdings LLC (formerly Virgin Trains USA)
7) Caesars Enterprise Services, LLC
8) Cognizant Technology Solutions
10) Consumer Access to Repair (CAR) Coalition
11) Credit Suisse Securities (USA) LLC
13) CTIA
14) DisposeRx, Inc.
15) Entertainment Software Association
16) Flagstar Bank
22) Mattress Firm
23) Mid-Sized Bank Coalition of America
24) Motion Picture Association
25) National Association of Vision Care Plans
26) National Lifeline Association
27) NCTA-The Internet & Television Association
29) Ontario Teachers' Pension Plan
31) Prudential Financial, Inc.
32) S&P Global
33) Samsung Electronics America
34) Select Medical Corporation
35) SPIE
37) The Travelers Companies, Inc. and subsidiaries
38) Wiregrass Economic Development Corporation
40) Zogenix, Inc.
601 13th Street, NW, 11th Floor South, Washington, DC, 20005,
1) Aviator Capital Management, LLC
3) Cognizant Technology Solutions
5) Consumer Access to Repair (CAR) Coalition
8) CTIA
10) HNTB Corporation
12) NCTA-The Internet & Television Association
14) Overseas Shipholding Group, Inc.
15) Raytheon Technologies Corporation and Affiliates (FKA United Technologies Corp)
16) Samsung Electronics America
17) Select Medical Corporation
18) SPIE
20) U.S. Acute Care Solutions, LLC
(815) 341-9564
220 Lions Gate Drive, Cary, NC, 27518,
601 13th Street, NW, 11th Floor South, Washington, DC, 20005,
(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,
601 Thirteenth Street, NW, Eleventh Floor South, Washington, DC, 20005,
1) Airbus Americas Inc. (formerly Airbus Group)
2) American Beverage Association
6) Consumer Access to Repair (CAR) Coalition
9) CTIA
10) Globe Specialty Metals, Inc.
12) HNTB Corporation
13) Huntington Ingalls Incorporated
17) Overseas Shipholding Group, Inc.
18) Piper Networks
19) Postmates Inc
20) Raytheon Technologies Corporation and Affiliates (FKA United Technologies Corp)
21) Samsung Electronics America
22) Southern Company Services, Inc.
23) SPIE
25) The Travelers Companies, Inc. and subsidiaries
27) Verizon Communications, Inc.
914-255-0968
1660 Lincoln Street, Suite 2125, Denver, CO, 80264,
1) Adobe Inc.
2) Alliance for Pharmacy Compounding
5) Carbon Removal Co., Inc. dba Vaulted Deep
9) Colorado Soccer Association
10) CommuniCare Technology Inc.
11) Cornerstone Government Affairs
12) CRH Americas
14) Epiq Global
15) Generation Schools Network
16) GHGSat Inc.
19) Intuit
21) MxV Rail
22) Neighborhood Development Collaborative
23) Northwoods Consulting Partners, Inc.
24) Pano AI, Inc.
26) Recsol Recovery Solutions, LLC
27) Rocky Mountain Human Services
28) Sheet Metal and Air Conditioning Contractors' National Assoication Colorado Chapter
29) Solari
30) Southern Farm Bureau Casualty Insurance Company
31) 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) Caterpillar c/o MultiState Associates Inc.
9) Central Florida Gaming, LLC
10) Everglades Glades College Inc. dba Keiser University
13) Independent Colleges & Universities of Florida, Inc
14) Jabil Inc