(660) 924-9512
141 NE 13TH STREET SUITE 200, OKLAHOMA CITY, OK, 73104,
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.
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)
4) BRIGHTER HEIGHTS OKLAHOMA, LLC
6) COMMUNITY ASSOCIATIONS INSTITUTE
7) COOPER'S HAWK WINERY & RESTAURANTS
8) CORNERSTONE GOVERNMENT AFFAIRS, INC d/b/a CORNERSTONE GOVERNMENT AFFAIRS
11) IDEMIA IDENTITY & SECURITY USA LLC
12) LUGERT-ALTUS IRRIGATION DISTRICT
13) NATIONAL ASSOCIATION OF MUTUAL INSURANCE COMPANIES (NAMIC
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.
(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
4) BRIGHTER HEIGHTS OKLAHOMA, LLC
6) COOPER'S HAWK WINERY & RESTAURANTS
7) CORNERSTONE GOVERNMENT AFFAIRS
8) EGA AMERICA
11) IDEMIA IDENTITY & SECURITY USA LLC
12) LUGERT-ALTUS IRRIGATION DISTRICT
13) NATIONAL ASSOCIATION OF MUTUAL INSURANCE COMPANIES (NAMIC)
14) NORTH HIGHLAND
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.
129 WOOLEY STREET, SUITE 300, SOUTHAMPTON, NY, 11968,
(850) 224-5081
311 E Park Ave, Tallahassee, FL, 32301-1513,
1) 392 Farms, LLC d/b/a South Tip Wellness
2) 9001 Tamiami Trail Opco LLC dba Axiom Behavioral Health
3) Allied Universal Electronic Monitoring US, Inc. f/k/a Attenti US, Inc.
4) American Board of Physician Specialties
5) American Integrity Insurance Company of Florida
6) American Kratom Association
12) Baptist Health Care Corporation
13) Brevard County Sheriff's Office
17) Children's Home Society of Florida, The
19) Cirrus Aircraft
20) College Board
21) Collier County Board of County Commissioners
22) CommuniCare Technology, Inc. d/b/a Pulsara
23) CoreCivic, Inc.
25) Creative Game Technologies, LLC
26) Cystic Fibrosis Foundation
27) DraftKings, Inc.
28) Eastern Florida State College Foundation
29) Elevator Industry Work Preservation Fund
30) Employer Direct Healthcare
31) Everytown for Gun Safety Action Fund
32) First Due Holdings, Inc., through its wholly-owned subsidiary Locality Media, LLC dba First Due
33) Florida Association for Child Care Management
34) Florida Association of Nurse Anesthetists DBA Florida Association of Nurse Anesthesiology
35) Florida Association of Professional Employer Organizations
36) Florida Bar, Family Law Section, The
37) Florida Chamber of Commerce
40) Florida Hospital Association
41) Florida Institute for Human & Machine Cognition, Inc.
43) Florida Land Title Association
44) Florida Surveying and Mapping Society
45) Florida Thoroughbred Breeders' and Owners' Association
46) Forerunner Industries, Inc.
47) Foundation for Florida's Future
50) H. Lee Moffitt Cancer Center & Research Institute
51) Idemia Identity & Security USA LLC
52) ISF, Inc.
53) Jazz Pharmaceuticals, Inc.
54) JM Family Enterprises, Inc
55) Johnson & Johnson Services, Inc.
56) Marine Industries Association of South Florida
57) MOORE COMMUNICATIONS GROUP, INC.
58) NaphCare, Inc.
59) National Council of State Boards of Nursing
63) Prime Pediatric Dental Group, PA
66) Ringling College of Art & Design
67) Saiva AI, Inc.
68) Southern Healthcare Management, LLC
70) TD Bank US Holding Company
71) The Henry and Rilla White Youth Foundation, Inc.
72) TMX Finance of Florida, Inc./Buckeye Check Cashing of Florida, Inc.
73) Transfr Inc
74) Turo Inc.
75) University of Florida Foundation, Inc
76) Via Science, Inc
77) Walt Disney Parks & Resorts U.S. Inc.
78) Xello Inc.
225-907-6090
17265 RUE VILLAGE, PRAIRIEVILLE, Louisiana, 70769,
(850) 224-5081
311 E Park Ave, Tallahassee, FL, 32301,
1) Allied Universal Electronic Monitoring US, Inc. f/k/a Attenti US, Inc.
2) American Board of Physician Specialties
3) American Integrity Insurance Company of Florida
4) American Kratom Association
8) Baptist Health Care Corporation
9) Brevard County Sheriff's Office
13) Children's Healing Institute, The
14) Children's Home Society of Florida, The
16) Cirrus Aircraft
17) City of Cocoa
20) College Board
21) CommuniCare Technology, Inc. d/b/a Pulsara
22) Conklin Davis Center for the Visually Impaired
23) Creative Game Technologies, LLC
24) Cystic Fibrosis Foundation
25) DraftKings, Inc.
27) Eastern Florida State College Foundation
28) Elevator Industry Work Preservation Fund
29) Employer Direct Healthcare
30) Everytown for Gun Safety Action Fund
31) Exchange Club Family Center, Inc.
32) First Due Holdings, Inc., through its wholly-owned subsidiary Locality Media, LLC dba First Due
33) Florida Association for Child Care Management
34) Florida Association of Nurse Anesthetists DBA Florida Association of Nurse Anesthesiology
35) Florida Association of Professional Employer Organizations
36) Florida Bar, Family Law Section, The
39) Florida Health Care Association
40) Florida Hospital Association
41) Florida Institute for Human & Machine Cognition, Inc.
42) Florida Land Title Association
43) Florida Surveying and Mapping Society
44) Florida Thoroughbred Breeders' and Owners' Association
45) Forerunner Industries, Inc.
46) Foundation for Florida's Future
49) H. Lee Moffitt Cancer Center & Research Institute
50) Idemia Identity & Security USA LLC
51) ISF, Inc.
52) Jazz Pharmaceuticals, Inc.
53) JM Family Enterprises, Inc
54) Johnson & Johnson Services, Inc.
56) MOORE COMMUNICATIONS GROUP, INC.
57) NaphCare, Inc.
58) National Council of State Boards of Nursing
59) Osceola Legislative Effort
61) Partners for Florida's Children and Families Inc.
66) Ringling College of Art & Design
67) Saiva AI, Inc.
68) Southern Healthcare Management, LLC
69) TD Bank US Holding Company
70) TMX Finance of Florida, Inc./Buckeye Check Cashing of Florida, Inc.
71) Transfr Inc
72) Turo Inc.
73) University of Florida Foundation, Inc
74) Via Science, Inc
75) Xello Inc.
(972) 510-8067
14674 RUPE DR., ARCADIA, OK, 73007,
3) AMERICAN DIABETES ASSOCIATION
5) BRIGHTER HEIGHTS OKLAHOMA, LLC
7) COMMUNITY ASSOCIATIONS INSTITUTE
8) COOPER'S HAWK WINERY & RESTAURANTS d/b/a COOPER'S HAWK WINERY & RESTAURANTS
9) CORNERSTONE GOVERNMENT AFFAIRS, INC
10) HAGEMAN CAPITAL
12) IDEMIA IDENTITY & SECURITY USA LLC
(850) 224-5081
311 E Park Ave, Tallahassee, FL, 32301,
1) 392 Farms, LLC d/b/a South Tip Wellness
2) 9001 Tamiami Trail Opco LLC dba Axiom Behavioral Health
3) Allied Universal Electronic Monitoring US, Inc. f/k/a Attenti US, Inc.
4) American Board of Physician Specialties
5) American Integrity Insurance Company of Florida
6) American Kratom Association
12) Baptist Health Care Corporation
13) Brevard County Sheriff's Office
17) Children's Healing Institute, The
18) Children's Home Society of Florida, The
20) Cirrus Aircraft
21) City of Cocoa
23) City of Naples
25) College Board
26) Collier County Board of County Commissioners
27) CommuniCare Technology, Inc. d/b/a Pulsara
28) Conklin Davis Center for the Visually Impaired
29) CoreCivic, Inc.
31) Creative Game Technologies, LLC
32) Cystic Fibrosis Foundation
35) DraftKings, Inc.
37) Eastern Florida State College Foundation
38) Elevator Industry Work Preservation Fund
39) Elsa Hernandez on behalf of Heriberto Sanchez Mayen
40) Employer Direct Healthcare
41) Everytown for Gun Safety Action Fund
42) Exchange Club Family Center, Inc.
43) Farm Share, Inc.
44) First Due Holdings, Inc., through its wholly-owned subsidiary Locality Media, LLC dba First Due
45) Florida Association for Child Care Management
46) Florida Association of Counties
47) Florida Association of Nurse Anesthetists DBA Florida Association of Nurse Anesthesiology
48) Florida Association of Professional Employer Organizations
49) Florida Bar, Family Law Section, The
50) Florida Chamber of Commerce
51) Florida Harbor Pilots Association, Inc.
52) Florida Health Care Association
53) Florida Hospital Association
54) Florida Institute for Human & Machine Cognition, Inc.
56) Florida Land Title Association
57) Florida Surveying and Mapping Society
58) Florida Thoroughbred Breeders' and Owners' Association
59) Forerunner Industries, Inc.
60) Foundation for Florida's Future
63) H. Lee Moffitt Cancer Center & Research Institute
64) Idemia Identity & Security USA LLC
65) ISF, Inc.
66) Jazz Pharmaceuticals, Inc.
67) JM Family Enterprises, Inc
68) Johnson & Johnson Services, Inc.
69) Marine Industries Association of South Florida
71) MOORE COMMUNICATIONS GROUP, INC.
72) NaphCare, Inc.
73) National Council of State Boards of Nursing
74) Osceola Legislative Effort
76) Partners for Florida's Children and Families Inc.
79) Prime Pediatric Dental Group, PA
82) Ringling College of Art & Design
83) Saiva AI, Inc.
84) Southern Healthcare Management, LLC
86) TD Bank US Holding Company
87) The Henry and Rilla White Youth Foundation, Inc.
88) TMX Finance of Florida, Inc./Buckeye Check Cashing of Florida, Inc.
89) Transfr Inc
90) Turo Inc.
91) University of Florida Foundation, Inc
92) Via Science, Inc
93) Walt Disney Parks & Resorts U.S. Inc.
94) Xello Inc.
600 PENNSYLVANIA AVENUE, SE, SUITE 300, WASHINGTON, DC, 20003,
(850) 224-5081
311 E Park Avenue, Tallahassee, FL, 32301,
1) 392 Farms, LLC d/b/a South Tip Wellness
2) Allied Universal Electronic Monitoring US, Inc. f/k/a Attenti US, Inc.
3) American Board of Physician Specialties
4) American Integrity Insurance Company of Florida
5) American Kratom Association
10) Baptist Health Care Corporation
11) Brevard County Sheriff's Office
15) Children's Healing Institute, The
16) Children's Home Society of Florida, The
18) Cirrus Aircraft
19) City of Cocoa
21) City of Naples
22) College Board
23) Collier County Board of County Commissioners
24) CommuniCare Technology, Inc. d/b/a Pulsara
25) CoreCivic, Inc.
26) Creative Game Technologies, LLC
27) Cystic Fibrosis Foundation
28) DraftKings, Inc.
29) Eastern Florida State College Foundation
30) Elevator Industry Work Preservation Fund
31) Elsa Hernandez on behalf of Heriberto Sanchez Mayen
32) Employer Direct Healthcare
33) Everytown for Gun Safety Action Fund
34) Exchange Club Family Center, Inc.
35) Farm Share, Inc.
36) First Due Holdings, Inc., through its wholly-owned subsidiary Locality Media, LLC dba First Due
37) Florida Association for Child Care Management
38) Florida Association of Counties
39) Florida Association of Nurse Anesthetists DBA Florida Association of Nurse Anesthesiology
40) Florida Association of Professional Employer Organizations
41) Florida Bar, Family Law Section, The
42) Florida Harbor Pilots Association, Inc.
43) Florida Health Care Association
44) Florida Hospital Association
45) Florida Institute for Human & Machine Cognition, Inc.
46) Florida Land Title Association
47) Florida Surveying and Mapping Society
48) Florida Thoroughbred Breeders' and Owners' Association
49) Forerunner Industries, Inc.
50) Foundation for Florida's Future
53) H. Lee Moffitt Cancer Center & Research Institute
54) Idemia Identity & Security USA LLC
55) ISF, Inc.
56) Jazz Pharmaceuticals, Inc.
57) JM Family Enterprises, Inc
58) Johnson & Johnson Services, Inc.
60) MOORE COMMUNICATIONS GROUP, INC.
61) NaphCare, Inc.
62) National Council of State Boards of Nursing
63) Osceola Legislative Effort
65) Partners for Florida's Children and Families Inc.
69) Saiva AI, Inc.
70) Southern Healthcare Management, LLC
72) TD Bank US Holding Company
73) The Henry and Rilla White Youth Foundation, Inc.
74) TMX Finance of Florida, Inc./Buckeye Check Cashing of Florida, Inc.
75) Transfr Inc
76) Turo Inc.
77) University of Florida Foundation, Inc
78) Via Science, Inc
79) Xello Inc.
159 WOLF RD, SUITE 300, ALBANY, NY, 12205,
600 PENNSYLVANIA AVENUE, SE, SUITE 300, WASHINGTON, DC, 20003,
(512)9042301
1122 Colorado Street, Suite 2399, Suite 2399, Austin, TX, 78701,
1) Accenture
2) Beachview Logistics US, Inc.
4) CPS Energy
6) Emerus Development Company, LLC
8) Greater Austin Economic Development Corporation, Inc. DBA Opportunity Austin
10) Hild & Hild, LLC
11) Idemia Identity & Security USA LLC
12) Jackpocket LLC