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Links:Website

Assists the firm's Oklahoma City government relations team with client service activities including conducting research and providing updates on state legislative matters and diverse regulatory issues

Previously served as account executive at Lilly & Company

Former congressional intern for Representative Stephanie Bice (R-OK)

Lauren McCay serves as a Senior Associate in Cornerstone's Oklahoma City office, assisting the firm's government relations team with client service activities including conducting research and providing updates on state legislative matters and diverse regulatory issues.

Lauren comes to Cornerstone from Lilly & Company where she led the firm's highly successful fundraising effort in Oklahoma as an Account Executive. She was responsible for executing numerous fundraisers and meeting fundraising goals for current federal legislators and those seeking office in the U.S House and Senate.

Before joining Lilly & Company, Lauren served as a Congressional Intern for Representative Stephanie Bice (R-OK) where she managed and answered constituent inquiries while also supporting staff by taking initiative on various district office projects and case work.

Lauren received her Bachelor of Science in political science from the University of Oklahoma.

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Links:Website

Member of the Oklahoma Bar Association

Published multiple works in The Oklahoman

Steven Barker joined Cornerstone as a Principal in our Oklahoma office in November 2025.

Prior to Cornerstone he served as Assistant Municipal Counselor for the City of Oklahoma City. In this role, he represented the city in eminent domain and land use matters, advised the City Manager's Office and Planning Department and supported key strategic initiatives, including securing a 25-year lease agreement with the Oklahoma City Thunder.

Previously, Steven served as General Counsel at Coop Ale Works, providing nationwide regulatory guidance to support product distribution. In this role, he managed all federal and state compliance, negotiated agreements with distributors and oversaw the company's licensing portfolio.

Earlier in his career, Steven worked with the Oklahoma Alcoholic Beverage Laws Enforcement Commission, where he held leadership roles as Deputy Director and General Counsel. He has also served as an Assistant Attorney General in the Oklahoma Attorney General's Office and as Assistant General Counsel with the Oklahoma Tax Commission. Steven currently serves as Chief Municipal Judge for the City of Warr Acres, where he presides over arraignment, juvenile and trial dockets.

Steven holds a Juris Doctor from Oklahoma City University School of Law and a Bachelor of Arts in Political Science from Pittsburg State University.

  • (405) 938-7138

  • 141 NE 13TH STREET SUITE 200OKLAHOMA CITYOK73104

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Links:Website

Respected public policy professional with experience in statewide campaigns, legislative engagement, and building strategic partnerships

Former vice president at Advanced Power Alliance

Former vice president of field operations at the Oklahoma Farm Bureau

Mark Yates joined Cornerstone in July 2021 as a principal in the firm's Oklahoma City office. His experience in public policy includes working with various industries through statewide campaigns, legislative engagement, media relations, and public speaking. Mark has been successful navigating complex and challenging initiatives on behalf of the clean energy and agriculture industries.

Mark previously served as vice president at Advanced Power Alliance (APA) where he represented leading domestic and international companies in the renewable energy sector. While in this role, he managed the association's regional public policy strategy, communications strategy, and membership recruitment efforts. Mark served a major role in shaping legislative and regulatory policy within the most important energy region in the country.

Prior to APA, Mark worked at the Oklahoma Farm Bureau, where he led membership recruitment initiatives, mobilized a statewide grassroots campaign, and lobbied for rural issues on behalf of the nearly 90,000 farmers and ranchers.

Before his time with the Farm Bureau, Mark was a professional educator in the Oklahoma public school system for 11 years. Along with his teaching experience, Mark also had administrative experience serving as a federal programs director for Plainview Public Schools in Ardmore, OK.

Mark is a graduate of East Central University in Ada, OK and holds a bachelor's degree in History and master's in Secondary Administration. Mark and his wife Stacy reside in Edmond, OK where they are active in their community and have two children, Londyn and Steele.

NEIL ALLDREDGE

(Indiana)
  • (317) 875-5250

  • 3601 Vincennes RoadIndianapolisIN46268

  • (317) 876-4205

  • 3601 Vincennes RoadIndianapolisIN46268

PHILLIP ARNZEN

(Nebraska)
  • 3601 Vincennes RoadIndianapolisIN46268

PHILLIP ARNZEN

(Colorado)
  • 317-876-4205

  • 3601 Vincennes RoadIndianapolisIN46268

PHILLIP ARNZEN

(Iowa)
  • 317-876-4205

  • 3601 Vincennes RoadIndianapolisIN46268

PHILLIP ARNZEN

(Kansas)
Clients:

JONATHAN BERGNER

(Federal)
  • 20 F ST. NW, Suite 510WASHINGTONDC20001

Clients:

BRIAN CHRISTENBERRY

(Michigan)
  • 7036841110

  • 1000 WILSON BLVD STE 1800 % MULTISTATE ASSOCIATES LLCARLINGTONVA22209

BRIAN CHRISTENBERRY

(Illinois)

VAUN CLEVELAND

(Federal)
  • 20 F ST. NW, Suite 510WASHINGTONDC20001

KATHERINE DAPPER

(Federal)
  • 25 MASSACHUSETTS AVENUE, NWSUITE 600WashingtonDC20001-7400

Clients:

GREGG DYKSTRA

(Federal)

PATRICK FINNEGAN

(Federal)
  • 20 F ST. NW, Suite 510WASHINGTONDC20001

JAMES GRANDE

(Federal)
  • 20 F ST. NW, Suite 510WASHINGTONDC20001

  • 2025590170

  • 800 North Capitol Street, NW, Suite 800WashingtonDC20002

Clients:

1) Action Now Initiative, LLC (ANI)

2) AICPA Association of International Certified Professional Accountants

3) Airlines for America

4) Alabama Institute for Deaf and Blind

5) Alabama-Coushatta Tribe of Texas

6) Alkermes, Inc.

7) Ally Financial Inc.

8) ALPHA Facilities Solutions, LLC

9) Altria Client Services LLC

10) American Association of Timeshare Owners Inc.

11) American Land Title Association

12) American Shrimp Processors Association

13) Apollo Education Group

14) AT&T Services, Inc.

15) Atlantic Broadband

16) Autos Drive America

17) Aventiv Technologies LLC and various subsidiaries

18) Black Belt Energy

19) Booz Allen Hamilton Inc.

20) Brennan Center for Justice

21) Bristol-Myers Squibb

22) BYD Motors Inc.

23) Chesapeake Bay Commission

24) City of Baton Rouge and Parish of East Baton Rouge

25) Cook Inlet Housing Authority (CIHA)

26) Cook Inlet Region Incorporated (CIRI)

27) Credit Union National Association

28) Diageo North America, Inc.

29) Diesel Outboards LLC

30) Douglas County Public Utility District

31) Dropbox, Inc.

32) Eisai, Inc.

33) Energy Innovation Reform Project

34) Expedia, Inc.

35) Financial Service Centers of America (FiSCA)

36) Fitch Ratings

37) Genentech, Inc.

38) Google Inc.

39) Green Business Certification Inc.

40) Guardian Centers of Georgia, LLC

41) Heat Biologics, Inc.

42) HollyFrontier Corporation

43) Huntington Ingalls Incorporated

44) IDEMIA Identity & Security USA, LLC

45) Infor (US), Inc.

46) Intellia Therapeutics

47) Intoxalock

48) JoshCo Group, LLC

49) KnowBe4, Inc.

50) Koch Companies Public Sector LLC

51) Lake Tindall, LLP on behalf of Mississippi Levee Board

52) LCMC Health

53) LHC Group

54) Liberty Mutual Group Inc.

55) Lodging Solutions, LLC d/b/a Accommodations Plus International

56) LOOP LLC

57) Los Angeles World Airports (LAWA)

58) Marine Jet Power, Inc. (MJP)

59) Marsh & McLennan Companies, Inc.

60) McCain Institute Foundation

61) Merck & Co., Inc.

62) Morgan Stanley & Co. LLC

63) National Association of Farm Service Agency County Office Employees (NASCOE)

64) National Association of Mutual Insurance Companies

65) National Association of Realtors

66) National Athletic Trainers' Association

67) National Medal of Honor Museum

68) New Mexico Council of Outfitters and Guides

69) New York Air Brake, LLC

70) Nissan North America, Inc.

71) nLIGHT Corporation

72) Norfolk Southern Corporation

73) Nuclear Innovation Alliance

74) OATLY, Inc.

75) Ocean Aero, Inc.

76) Paragon Healthcare, Inc.

77) Pernod Ricard USA

78) Pharmaceutical Research and Manufacturers of America

79) PODS Enterprises, LLC

80) Port of Everett

81) Port of Kalama

82) Professional Golfers' Association of America

83) ProShare Advisors LLC

84) Protective Life Corporation

85) Raven Aerostar Technical Solutions

86) Raytheon Technologies Corporation

87) Ryan Air, Inc.

88) Safari Club International

89) SAFE Boats International, LLC

90) Salesforce.com, Inc.

91) Sanderson Farms, Inc.

92) Sanofi US Services Inc.

93) Securities Industry and Financial Markets Association (SIFMA)

94) Sempra Energy

95) Shield AI, Inc.

96) SitelogIQ

97) Spider Strategies, Inc.

98) Spokane Tribe of Indians

99) SSA Marine

100) Sunrise Foods International Inc.

101) Takeda Pharmaceuticals America, Inc.

102) TikTok Inc.

103) TRANS UNION LLC

104) Transamerica Companies

105) Travere Therapeutics (fka Retrophin)

106) Truckee Tahoe Airport District

107) U.S. Sugar Corporation

108) United Site Services, Inc.

109) Van Ness Feldman, LLP on behalf of Columbia River Treaty Power Group

110) Vera Institute of Justice, Inc.

111) Visa, Inc.

112) VMware, Inc.

113) Washington State Department of Transportation

114) Zepher, Inc.

Clients:

ANDREW HUFF

(Federal)
  • 20 F ST. NW, Suite 510WASHINGTONDC20001

ANDREW KIRKNER

(Indiana)
  • (540) 440-0360

  • 9101 Stony Point ParkwayApartment 1422RichmondVA23235

CHRISTOPHER LAMOND

(Federal)
Clients:

1) AARP

2) Advanced Technology International (On behalf of National Armaments Consortium)

3) Advocate Aurora

4) Alkermes, Inc.

5) Alliance for Cell Therapy Now

6) Alliance for Drone Innovation (informal)

7) Allstate Insurance Company

8) Altria Client Services, Inc.

9) American Financial Services Association (AFSA)

10) American Seniors Housing Association

11) American Society of Composers, Authors and Publishers (ASCAP)

12) American Speech-Language-Hearing Association

13) Anduril

14) Biogen

15) BlackLine, Inc.

16) Boehringer Ingelheim Pharmaceuticals, Inc.

17) Broward County, FL

18) Carbon Solutions Group

19) Cargo Airline Association

20) CCC Information Services

21) Central Florida Expressway Authority

22) CGI Federal, Inc.

23) Charlotte County, FL

24) City of Gresham

25) City of Manteca, CA

26) City of Pismo Beach, CA

27) City of Roseville

28) City of Santa Maria, CA

29) City of Visalia, CA

30) City of Wichita, KS

31) College of Healthcare Information Management Executives (CHIME)

32) Comcast Corporation

33) Conduent, Inc. and its Affiliates

34) Continuing Medical Education Coalition

35) Cystic Fibrosis Foundation

36) Danbury Mission Technologies, LLC

37) Del Norte County, CA

38) Depression Bipolar Support Alliance (DBSA)

39) eBay, Inc.

40) Encore Capital Group

41) Environmental Working Group

42) Equifax Inc.

43) Exelixis

44) FedEx Corporation

45) Financial Services Institute

46) Florida Inland Navigation District

47) Fluor Corporation

48) ForeScout Technologies, Inc.

49) General Atomics - Aeronautical Systems, LLC

50) General Atomics, Electromagnetic Systems, Inc.

51) Geost, Inc.

52) Glaukos Corporation

53) GlaxoSmithKline LLC

54) Harmony Biosciences

55) Horizon Therapeutics USA, Inc. (formerly known as Horizon Pharma USA, Inc)

56) Huntington's Disease Society of America

57) Imprivata, Inc.

58) InComm Holdings, Inc.

59) Institute for Gene Therapies

60) InterDigital, Inc.

61) International Packaged Ice Association

62) Jackson National Life Insurance Company

63) JM Family Enterprises, Inc

64) JTR Strategies on behalf of Jetblue Airways Corporation

65) Kentucky Community and Technical College System

66) KIA Motors Corporation

67) Los Angeles County, Office of Education

68) Marion County, FL

69) Martin County, FL

70) McAllister & Quinn on behalf of Villanova University

71) Medical Device Manufacturers Association

72) Medline Industries, Inc.

73) Melbourne Airport Authority

74) MetaBank

75) Monroe County, FL

76) Mortgage Bankers Association

77) National Association for the Employment of People Who Are Blind (NAEPB)

78) National Association of Mutual Insurance Companies

79) National Council for Behavioral Health

80) National Football League

81) National Home Infusion Association

82) National Shooting Sports Foundation, Inc.

83) North Texas Commission

84) Novartis Corporation

85) NW Natural

86) OneMain Financial Group, LLC

87) Ounce of Prevention Fund

88) Palm Beach County, FL

89) Park Board of Trustees of the City of Galveston, TX

90) Partnership for Part D Access (informal coalition)

91) PayPal

92) PIPE-Partnership for Infrastructure Project Excellence (informal coalition)

93) Professional Compounding Centers of America

94) Prudential Financial, Inc.

95) Radiology Business Management Association (RBMA)

96) Raytheon Technologies Corporation (formerly United Technologies Corporation)

97) Republic Airlines, Inc.

98) Robinhood

99) San Bernardino City Unified School District

100) Sanofi US Services Inc.

101) Sedgwick County, KS

102) Small Business Investor Alliance (SBIA)

103) Solve ME/CFS Initiative

104) St. Lucie County, FL

105) T-Mobile USA, Inc.

106) Telehealth Access for Behavioral Health

107) TerSera Therapeutics

108) Texas Association of Business

109) The Biosimilars Forum

110) The Goodyear Tire & Rubber Company

111) Tripadvisor LLC

112) Unified Government of Wyandotte County/Kansas City, Kansas

113) University of Tennessee

114) Village of Islamorada, FL

115) Village of Key Biscayne, FL

116) Vocera Communications

117) West Coast Inland Navigation District

118) Wine and Spirits Wholesalers of America, Inc.

  • 800 North Capitol Street, NW, Suite 800WashingtonDC20002

Clients:

SEAN MCLAUGHLIN

(Connecticut)

SEAN MCLAUGHLIN

(Vermont)

SEAN MCLAUGHLIN

(Massachusetts)
  • 973-879-4602

  • 3601 Vincennes RoadIndianapolisIN46268

SEAN MCLAUGHLIN

(Rhode Island)

SEAN MCLAUGHLIN

(Maine)

SEAN MCLAUGHLIN

(New Hampshire)
  • 800 North Capitol Street, NW, Suite 800WashingtonDC20002

Clients:
Clients:

1) A16Z CAPITAL MANAGEMENT, LLC

2) AFFORDABLE ASSISTED LIVING COALITION

3) AMEREN ILLINOIS

4) AMERICAN ASSOCIATION OF ORTHODONTIST

5) AMERICAN COUNCIL OF LIFE INSURERS

6) ANAPLAN INC.

7) AUTO AND TRUCK RECYCLERS OF ILLINOIS

8) BAYER U.S. LLC

9) COLLINSVILLE CUSD #10

10) COPACK INDUSTRIES LLC

11) DECATUR DOWNS LLC

12) DESTINATION ILLINOIS LLC

13) DIRECTV, LLC

14) DUCKS UNLIMITED

15) ECHOSTAR CORPORATION AND ITS AFFILIATES

16) ENTERPRISE LEASING COMPANY OF CHICAGO, LLC DBA ENTERPRISE MOBILITY

17) EXXON MOBIL CORPORATION

18) FIREMEN'S ANNUITY & BENEFIT FUND OF CHICAGO

19) FMR, LLC

20) FORESIGHT ENERGY, LLC

21) GERONIMO POWER, LLC

22) GOOGLE LLC AND ITS AFFILIATES

23) GRAND PRAIRIE WATER COMMISSION

24) HEALTH CARE COUNCIL OF ILLINOIS

25) I3 BROADBAND

26) ID.ME

27) ILLINOIS ASSOCIATION OF VOCATIONAL AGRICULTURE TEACHERS

28) ILLINOIS CENTRAL RAILROAD COMPANY

29) ILLINOIS COMMUNITY COLLEGE TRUSTEES ASSOCIATION

30) ILLINOIS HEALTH & HOSPITAL ASSOCIATION

31) ILLINOIS LIFE & HEALTH INSURANCE COUNCIL

32) ILLINOIS PHYSICAL THERAPY ASSOCIATION

33) ILLINOIS PIPE TRADES, P.E.C.

34) ILLINOIS PUBLIC HIGHER EDUCATION COOPERATIVE

35) ILLINOIS RADIOLOGICAL SOCIETY

36) ILLINOIS RETAIL MERCHANTS ASSOCIATION

37) ILLINOIS SOCIETY OF ANESTHESIOLOGISTS

38) ILLUMINATIVE STRATEGIES INC.

39) INTERNATIONAL UNION OF OPERATING ENGINEERS LOCAL 318

40) INTERNATIONAL UNION OF OPERATING ENGINEERS LOCAL 520

41) INTERNATIONAL UNION OF OPERATING ENGINEERS LOCAL 649

42) INTERNATIONAL UNION OF OPERATING ENGINEERS LOCAL 841

CHRISTOPHER NICOLOPOULOS

(Connecticut)

CHRISTOPHER NICOLOPOULOS

(Vermont)

MATT OVERTURF

(New Jersey)
  • 3601 Vincennes RdIndianapolisIN46268

MATT OVERTURF

(Pennsylvania)

MATT OVERTURF

(Ohio)
  • 937.935.0432

  • 530 Eagle Walk RoadDelawareOH43015

ANDREW PERKINS

(Indiana)
  • (847) 373-3525

  • 1604 Toronto RdApt.11SpringfieldIL62712

ANDREW PERKINS

(North Dakota)
  • (847) 373-3525

  • CHICAGOIL60642-6108

Clients:

CHRISTIAN RATAJ

(Nevada)

CHRISTIAN RATAJ

(Alaska)

CHRISTIAN RATAJ

(Hawaii)

JONATHAN RODGERS

(Indiana)
  • (317) 875-5250

  • 3601 Vincennes RoadIndianapolisIN46268

GINA ROTUNNO

(North Carolina)

GINA ROTUNNO

(West Virginia)

GINA ROTUNNO

(South Carolina)
  • 3178764256

  • 3601 Vincennes RoadIndianapolisIN46268

GINA ROTUNNO

(Virginia)

GINA ROTUNNO

(Delaware)
  • 3601 Vincennes RoadIndianapolisIN46268

Clients:

CHRISTOPHER STARK

(New York)
  • 317-875-5250

  • 3601 VINCENNES ROADINDIANAPOLISIN

JOSHUA STEPHENS

(Tennessee)

JOSHUA STEPHENS

(Florida)
  • (678) 697-2670

  • 3601 Vincennes RoadIndianapolisIndiana46268

JOSHUA STEPHENS

(Mississippi)

JOSHUA STEPHENS

(Louisiana)
  • 678-697-2670

  • 3601 VINCENNES ROADINDIANAPOLISIndiana46268

JOSHUA STEPHENS

(Georgia)

JOSHUA STEPHENS

(Alabama)

BRANDON VICK

(Montana)

BRANDON VICK

(Washington)

BRANDON VICK

(Oregon)

BRANDON VICK

(Wyoming)

BRANDON VICK

(Idaho)
  • 3601 Vincennes RoadIndianapolisIN46268

ERICA WEYHENMEYER

(Illinois)