Sponsored Ad

STEVEN BARKER

Subjects: All Subjects

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.

LAUREN MCCAY

Subjects: All Subjects

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.

JON YATES

  • (405) 938-7138

  • 141 NE 13TH STREET SUITE 200, OKLAHOMA CITY, OK, 73104, 

Subjects: All Subjects

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.

Clients:

NEIL ALLDREDGE

(Indiana, )

NEIL ALLDREDGE

(Indiana, )
  • (317) 876-4205

  • 10 W 106th Street, Suite 100, Indianapolis, IN, 46290, 

PHILLIP ARNZEN

(Nebraska, )
  • 10 W 10th Street, Suite 100, Indianapolis, IN, 46290, 

PHILLIP ARNZEN

(Colorado, )
  • 317-876-4205

  • 10 W 106th Street, Suite 100, Indianapolis, IN, 46290 , 

PHILLIP ARNZEN

(North Dakota, )
  • (317) 876-4205

  • 10 W 106TH ST, STE 100, CARMEL, IN, 46290-1002, 

PHILLIP ARNZEN

(Iowa, )
  • 317-876-4205

  • 10 W. 106th Street, Suite 100, Indianapolis, IN, 46290, 

Clients:
Clients:

BRIAN CHRISTENBERRY

BRIAN CHRISTENBERRY

(Indiana, )

BRIAN CHRISTENBERRY

BRIAN CHRISTENBERRY

(Indiana, )

BRIAN CHRISTENBERRY

BRIAN CHRISTENBERRY

(Michigan, )
  • (703) 684-1110

  • 1000 WILSON BLVD, STE 1800 % MULTISTATE ASSOCIATES LLC, ARLINGTON, VA, 22209, 

BRIAN CHRISTENBERRY

BRIAN CHRISTENBERRY

(Wisconsin, )

BRIAN CHRISTENBERRY

BRIAN CHRISTENBERRY

(Illinois, )
  • 20 F Street NW, Suite 510, Washington, DC, 20001, 

Clients:

CHAD KUNDE

(Florida, )
  • (703) 300-6179

  • 1409 Devils Dip, Tallahassee, FL, 32308, 

CHAD KUNDE

(Tennessee, )

CHAD KUNDE

(Alabama, )

CHAD KUNDE

(Louisiana, )
  • 703-300-6179

  • 10 W. 106TH?STREET, SUITE 100, INDIANAPOLIS, Indiana, 46290, 

CHAD KUNDE

(Georgia, )
  • 202-559-0170

  • 800 North Capitol Street, NW, Suite 800, Washington, DC, 20002, 

Clients:

1) 3M COMPANY

2) ACCRETE AI GOVERNMENT, LLC

3) ADVANCED MEDICAL TECHNOLOGY ASSOCIATION (ADVAMED)

4) AEROSTAR INTERNATIONAL, LLC

5) AICPA ASSOCIATION OF INTERNATIONAL CERTIFIED PROFESSIONAL ACCOUNTANTS

6) AIRLINES FOR AMERICA

7) ALABAMA-COUSHATTA TRIBE OF TEXAS

8) ALKERMES, INC.

9) ALLY FINANCIAL INC.

10) ALTRIA CLIENT SERVICES LLC

11) ALTUMINT, INC.

12) AMERICAN ASSOCIATION OF COLLEGES OF OSTEOPATHIC MEDICINE

13) ANNE PRAMAGGIORE

14) ARRAY TECHNOLOGIES, INC.

15) ASSOCIATION FOR MATERIALS PROTECTION AND PERFORMANCE (AMPP)

16) ASSOCIATION OF PRIVATE NON-PROFIT INSTITUTIONS

17) AT&T SERVICES, INC.

18) ATKINSREALIS NUCLEAR SECURED, LLC

19) AVENTIV TECHNOLOGIES LLC AND VARIOUS SUBSIDIARIES

20) BLINK HEALTH, INC.

21) BLOCK INC.

22) BROAD INSTITUTE

23) CAPITAL ONE FINANCIAL CORPORATION

24) CARLOS ARGENAL

25) CENTERSTONE

26) CGI FEDERAL INC.

27) CHESAPEAKE BAY COMMISSION

28) CHUBB INA HOLDING COMPANY INC

29) COCA-COLA BOTTLING COMPANY UNITED, INC.

30) COHERE US, INC.

31) CONCORDANT LLC OBO AMERICANS GIVE LLC

32) COREWEAVE, INC.

33) CORNELL ABRAXAS GROUP, LLC

34) CORTEVA AGRISCIENCE LLC

35) COUPANG, INC.

36) DATA CENTER COALITION

37) DEFENSE CREDIT UNION COUNCIL

38) DEVON ENERGY CORPORATION

39) EDF POWER SOLUTIONS DEVELOPMENT, INC.

40) EINRIDE

41) EISAI, INC.

42) ELECTRONIC PAYMENTS COALITION

43) EVER-GREEN ENERGY, INC.

44) EXXON MOBIL CORPORATION

45) FINANCIAL SERVICES FORUM

46) FITCH RATINGS

47) GENERAL ATOMICS

48) GINKGO BIOWORKS, INC.

49) GOEL INVESTMENTS, LLC

50) GOULD INDUSTRIES LTD.

51) GREEN BUSINESS CERTIFICATION INC.

52) H&R BLOCK MANAGEMENT, LLC

53) HALEON US HOLDINGS LLC

54) HEMP BEVERAGE ALLIANCE

55) HF SINCLAIR CORPORATION

56) IDEMIA IDENTITY & SECURITY USA, LLC

57) INFIN A FINANCIAL SERVICES ALLIANCE

58) JOSHCO GROUP, LLC

59) KANE KESSLER, P.C. OBO CLARUS CORPORATION

60) KIDNEY CARE PARTNERS

61) KLASKO IMMIGRATION LAW PARTNERS, LLP ON BEHALF OF INTEALTH

62) KOCH GOVERNMENT AFFAIRS, LLC

63) KOCHAVIM BEHAVIORAL HEALTH INC.

64) LATHAM & WATKINS LLP OBO PEDIATRIC ASSOCIATES

65) LIBERTY MUTUAL GROUP INC.

66) LIFESCIENCE LOGISTICS

67) LPL FINANCIAL LLC

68) MADRIGAL PHARMACEUTICALS, INC.

69) MARSH MCLENNAN

70) MERCK & CO., INC.

71) MGM TRANSFORMERS, A FORGENT COMPANY

72) MINERALS TECHNOLOGIES INC.

73) MORGAN STANLEY & CO LLC

74) MOTOROLA SOLUTIONS, INC.

75) NATIONAL ASSOCIATION OF MUTUAL INSURANCE COMPANIES

76) NATIONAL ASSOCIATION OF REALTORS

77) NATIONAL ATHLETIC TRAINERS' ASSOCIATION

78) NATIONAL HARDWOOD LUMBER ASSOCIATION

79) NATIONAL MEDAL OF HONOR MUSEUM

80) NAVIGATE AFFORDABLE HOUSING PARTNERS, INC.

81) NIQUAN ENERGY, LLC

82) NISSAN NORTH AMERICA, INC.

83) NORFOLK SOUTHERN CORPORATION

84) NUCLEAR INNOVATION ALLIANCE

85) OCEAN AERO, INC.

86) PHARMACEUTICAL RESEARCH AND MANUFACTURERS OF AMERICA

87) PHILLIPS 66 COMPANY

88) PRECISION MOTION HEALTH

89) PROFESSIONAL GOLFERS' ASSOCIATION OF AMERICA

90) PROTON THERAPY CONSORTIUM

91) REBELLION DEFENSE, INC.

92) REFLECTION WINDOW + WALL, LLC

93) RESEARCH!AMERICA

94) ROSHEL INC.

95) ROUGH COUNTRY, LLC

96) SABLE OFFSHORE CORP.

97) SAFARI CLUB INTERNATIONAL

98) SALESFORCE.COM, INC.

99) SANOFI US SERVICES INC.

100) SECURITIES INDUSTRY AND FINANCIAL MARKETS ASSOCIATION (SIFMA)

101) SEMPRA ENERGY

102) SEYMOUR SUPPORT COUNCIL, INC. DBA FRIENDS OF SEYMOUR

103) SHIELD AI, INC.

104) SOFTWARE & INFORMATION INDUSTRY ASSOCIATION (SIIA)

105) SPRAY FOAM COALITION

106) SSA MARINE

107) STRATA CLEAN ENERGY, LLC

108) TAKEDA PHARMACEUTICALS AMERICA, INC.

109) TECHNET

110) THE BOEING COMPANY

111) THE PNC FINANCIAL SERVICES GROUP

112) THE SCORE ASSOCIATION

113) TIKTOK INC.

114) TIKTOK USDS JOINT VENTURE LLC

115) TRANSAMERICA COMPANIES

116) TRUCKERS INTEGRAL TO OUR ECONOMY INC (TIE)

117) U.S. SUGAR CORPORATION

118) UNITED STATES STEEL CORPORATION

119) UNIVERSITY OF PHOENIX

120) VERTEX PHARMACEUTICALS INCORPORATED

121) VISA, INC.

122) VMWARE, INC. OBO BROADCOM INC.

123) WORLD SHIPPING COUNCIL

124) X ENERGY, LLC

125) ZSCALER INC.

  • 20 F Street NW, Suite 510, Washington, DC, 20001, 

SEAN MCLAUGHLIN

(Connecticut, )

SEAN MCLAUGHLIN

(New York, )
  • 3601 VINCENNES ROAD, INDIANAPOLIS, IN, 46268, 

SEAN MCLAUGHLIN

(Vermont, )

SEAN MCLAUGHLIN

(Massachusetts, )
  • 973-879-4602

  • 10 W 106th Street, Suite 100,, Suite 100, Indianapolis, IN, 46290, 

SEAN MCLAUGHLIN

(Rhode Island, )

SEAN MCLAUGHLIN

(Maine, )

SEAN MCLAUGHLIN

(New Hampshire, )

GEORGE MCNAB

(Maryland, )
  • 317-875-5250

  • 3601 Vincennes Road, Indianapolis, IN, 46268, 

GEORGE MCNAB

(Pennsylvania, )

GEORGE MCNAB

(Ohio, )
  • 6146443463

  • 10 W 106th Street, Suite 100, Indianapolis, IN, 46290, 

GEORGE MCNAB

(New Jersey, )
  • 10 W 106th Street Suite 100, Indianapolis, IN, 46290, 

  • 800 North Capitol Street, NW, Suite 800, Washington, DC, 20002, 

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) CAPSTONE CONSULTING

10) COLLINSVILLE CUSD #10

11) COPACK INDUSTRIES LLC

12) DECATUR DOWNS LLC

13) DESTINATION ILLINOIS LLC

14) DIRECTV, LLC

15) DUCKS UNLIMITED

16) EARTH FUNERAL GROUP

17) ECHOSTAR CORPORATION AND ITS AFFILIATES

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

19) EXXON MOBIL CORPORATION

20) FIREMEN'S ANNUITY & BENEFIT FUND OF CHICAGO

21) FMR, LLC

22) FORESIGHT ENERGY, LLC

23) FOUR RIVERS SANITATION AUTHORITY

24) GERONIMO POWER, LLC

25) GOOGLE LLC AND ITS AFFILIATES

26) GRAND PRAIRIE WATER COMMISSION

27) HEALTH CARE COUNCIL OF ILLINOIS

28) I3 BROADBAND

29) ILLINOIS ASSOCIATION OF VOCATIONAL AGRICULTURE TEACHERS

30) ILLINOIS CENTRAL RAILROAD COMPANY

31) ILLINOIS COMMUNITY COLLEGE TRUSTEES ASSOCIATION

32) ILLINOIS HEALTH & HOSPITAL ASSOCIATION

33) ILLINOIS LIFE & HEALTH INSURANCE COUNCIL

34) ILLINOIS PHYSICAL THERAPY ASSOCIATION

35) ILLINOIS PIPE TRADES, P.E.C.

36) ILLINOIS PUBLIC HIGHER EDUCATION COOPERATIVE

37) ILLINOIS RADIOLOGICAL SOCIETY

38) ILLINOIS RETAIL MERCHANTS ASSOCIATION

39) ILLINOIS SOCIETY OF ANESTHESIOLOGISTS

40) ILLUMINATIVE STRATEGIES INC.

41) INTERNATIONAL UNION OF OPERATING ENGINEERS LOCAL 318

42) INTERNATIONAL UNION OF OPERATING ENGINEERS LOCAL 520

43) INTERNATIONAL UNION OF OPERATING ENGINEERS LOCAL 649

44) INTERNATIONAL UNION OF OPERATING ENGINEERS LOCAL 841

CHRISTOPHER NICOLOPOULOS

CHRISTOPHER NICOLOPOULOS

(Connecticut, )

MATT OVERTURF

(Ohio, )
  • 937.935.0432

  • 530 Eagle Walk Road, Delaware, OH, 43015, 

Clients:

CHRISTIAN RATAJ

(Nevada, )

CHRISTIAN RATAJ

(Alaska, )

CHRISTIAN RATAJ

(Hawaii, )

GINA ROTUNNO

(North Carolina, )
  • (317) 875-5250

  • 10 W 106th Street, Suite 100, Indianapolis, IN, 46290, 

GINA ROTUNNO

(West Virginia, )

GINA ROTUNNO

(South Carolina, )
  • 3178764256

  • 10 W 106th Street, Suite 100, Indianapolis, IN, 46290, 

  • 317-876-4256

  • 3601 Vincennes Road, Indianapolis, IN, 46268, 

GINA ROTUNNO

(Virginia, )

GINA ROTUNNO

(Delaware, )
  • 10 W. 106th Street Suite 100, Indianapolis, IN, 46290, 

Clients:

BRUCE SPENCER

(Montana, )

CHELSEA STALLINGS

(Kansas, )

CHELSEA STALLINGS

(Arizona, )
  • 317-876-6227

CHELSEA STALLINGS

(Arkansas, )

CHELSEA STALLINGS

(Oklahoma, )
  • (317) 876-6227

  • 10 W. 106TH STREET SUITE 100, INDIANAPOLIS, IN, 46290, 

CHELSEA STALLINGS

(Texas, )
  • (317)8766227

  • 10 W. 106th Street, Suite 100, Indianapolis, IN, 46290, 

CHELSEA STALLINGS

(Utah, )
  • (317) 876-6227

  • 10 W 106th Street, Suite 100, Indianapolis, IN, 46290, 

JOSHUA STEPHENS

(Mississippi, )

BRANDON VICK

(Montana, )

BRANDON VICK

(Washington, )

BRANDON VICK

(Oregon, )

BRANDON VICK

(Wyoming, )

BRANDON VICK

(Idaho, )
  • 10 W. 106 Street, Suite 100, Indianapolis, IN, 46290, 

STEPHEN VOLJAVEC

(Federal, )
Clients:

ERICA WEYHENMEYER

(Illinois, )