IAGC Staff

IAGC is the international trade association which represents the industry that provides geophysical services (geophysical data acquisition, seismic data ownership and licensing, geophysical data processing and interpretation, and associated services and product providers) to the oil and gas industry.

IAGC represents more than 150 member companies from all segments of the geophysical industry.  IAGC member companies:

  • come from all regions of the world;
  • globally employ tens of thousands of people;
  • range in size from the largest global full service contractors to individuals in business as sole proprietorships, and range from start-up companies to companies who provide geophysical goods and services to contractors and E&P companies alike;
  • represent the vast majority of both the global data acquisition capacity and the non-exclusive data in libraries today.



G. C. "Chip" Gill

Chip Gill is President of the International Association of Geophysical Contractors. IAGC is the international trade association representing the industry that provides geophysical data, services and equipment to the oil and gas industry.

Gill is a 30 year veteran of the oil and gas exploration and production (E&P) industry. In addition to his strong operational background, he has extensive experience working with governments on behalf of oil and gas interests around the world.

Under Gill’s leadership, IAGC has updated its mission, reorganized its governance and membership structure and restructured several of its key committees. In addition to its traditional efforts on government issues, HSE and standards and best practices, the Association has added the commercial health of the geophysical industry as a core focus. Thus the Association has fortified its initiatives in those areas which are of greatest value to geophysical contractors.

Before joining IAGC in 2001, Gill served as Vice-President of Membership and Strategic Planning at IPAA - the Independent Petroleum Association of America.


Prior to his decade of leadership in E&P industry trade associations, Gill managed government relations for Vastar Resources and ARCO for 11 years.  He first worked in the oil and gas industry as a Rig Hand for Ard Drilling Company while on summer break from University. Upon graduation, he spent the first decade of his career with ARCO working on the land and contract side of their upstream oil and gas business based in the US.

Gill holds a Bachelor of Business Administration in Petroleum Land Management from the University of Texas at Austin with an emphasis in Geology. He maintains his professional CPL certification, currently serves on numerous E&P industry association boards, maintains membership in numerous industry professional associations and actively volunteers his time to a local Boy Scouts of America scout troop. Gill is the author of numerous articles and professional papers, and has previously served as a Senate appointee to the Oklahoma Energy Resources Board and as an appointee to a US Marine Mammal Commission Federal Advisory Committee.

Gill lives in Houston, Texas USA with his wife, Nancy, and their two children.


Vice President - Projects & Issues

Walt Rosenbusch

Walt brings to the IAGC over 25  years of public and private sector experience and expertise in all aspects of  federal and state oil and gas upstream regulatory activities. Specific areas of  expertise include federal and state public land management, federal and state  regulatory accounting (tax and royalty), public law and policy development,  administrative law, auditing, training, and public sector consulting. His  knowledge of the issues facing governments and industry in regulatory  compliance and business processes are unique given his broad professional  experience. Walt has provided Advisory Services to industry clients on a  wide-range of regulatory compliance issues and government outreach strategies. He has consulted with governments around the  world on energy-specific issues and assisted his clients in advising the  Governments of Indonesia and Vietnam on energy specific issues.

Walt has served as Director of the Minerals Management  Service at the U.S. Department of the Interior, where he was directly  responsible for the management of federal mineral revenue and outer continental  shelf (OCS) leasing and administration programs. His charge was to promote  "best business practices" by encouraging the development and  implementation of innovative practices and new technology. He was also named  the Department of Interior's official representative to the Interstate Oil and  Gas Compact Commission in 2000.


Walt also worked as Vice President of Business Advisory Services and Government Relations at Petris where he provided consulting services to oil and gas clients in areas of business performance management and government  relations. Other professional positions Walt has held include: Special  Assistant to the Assistant Secretary for Land and Minerals Management at the  U.S. Department of the Interior, Senior Manager at Ernst & Young's Houston office, Deputy Land Commissioner for Energy Resources, Division Director for Royalty Management and Compliance, Royalty Audit Manager at the Texas General Land Office, and Senior Tax Auditor for the Texas Comptroller. Walt earned his Bachelor of Business Administration (Accounting) from the University of Texas at Austin.


Group Vice President - Environment

Karen St. John

Karen St. John comes to IAGC from BP America, where she was Senior Director of Regulatory Affairs in its WDC-based government relations office. She was responsible for developing and executing regulatory response and advocacy strategies around U.S. environmental policy and legislative and regulatory issues.

Karen spent 8 years with BP in international assignments in the U.K., Azerbaijan and Indonesia leading BP’s social performance and sustainability initiatives. This work included social & political risk management, developing and executing external relationship strategies, and developing partnerships with international financing and international development organizations.

Prior to her years with BP, Karen worked at the American Petroleum Institute as Regulatory Affairs Manager. She served in a senior consulting capacity for the U.S. Department of Energy and as a consultant for Weston Solutions and Battelle Memorial Institute.

Karen holds an International Business degree from Georgetown University, an MBA from Ohio State University, a Masters in Environmental Management from Duke University and an undergraduate BS degree from the University of Michigan.



Director of Communications

Gail Adams

Gail Adams is the Director of Communications at IAGC. She is a native of Shreveport, Louisiana, has 20 years of experience in the environment and natural resources public policy arena and working with states and local government. She has more than 27 years experience in public affairs, non-profit organizations, and governmental affairs.

Adams is the former Director of the Office of Intergovernmental and External Affairs (OIEA) for the Department of the Interior (DOI), Immediate Office of the Secretary. Her responsibilities were to establish and maintain relationships between the Department of the Interior and Governors, state and local elected officials and the more than 6000 stakeholders and organizations that represent interests related to DOI.

Gail also served as the Secretary’s contact for tourism and works with the tourism industry and tourism stakeholders. She was a member of the President’s Task Force for Tourism and Competitiveness, headed by Secretaries of the Interior Salazar and Bryson of the Commerce Department which developed the nation’s National Travel and Tourism Strategy. She served on the Secretary’s behalf on numerous tourism committees and boards.  She was a member of the Tourism Policy Council which leads the implementation of the National Travel and Tourism Strategy.


Prior to her appointment, Gail served as the Governmental Affairs Officer for MC252 Oil Spill on loan from FEMA to the U.S. Coast Guard. Gail received the Coast Guard Distinguished Service Award, the highest public recognition given by the Commandant of the Coast Guard for her work on the Deepwater Horizon Oil Spill.

As the Oil Spill Governmental Affairs Officer, Gail oversaw Intergovernmental Affairs, Congressional Affairs, the Non-Governmental Organization Interaction Unit, VIP and International visits as well as some aspects of Community Relations for the entire Gulf Coast. She also served as the governmental affairs advisor to the three Coast Guard Federal On-Scene Coordinators as a member of their Command Staff for the response.

She is the former Director of the Office of Intergovernmental Affairs, Department of External Affairs for FEMA’s Louisiana Transitional Recovery Office headquartered in New Orleans.  As the IGA Director, Gail headed intergovernmental operations for Louisiana offices for Hurricanes Katrina, Rita, Gustav and Ike. Gail also coordinated all foreign delegation meetings coming to Louisiana to learn lessons of response and recovery efforts.

Gail is a former television news anchor and radio personality. She is also a certified grants writer. Adams is a graduate of Louisiana State University.


Director - Environmental Regulation & Legal Affairs

Nikki Martin

Nikki Martin joined IAGC in September 2013 as part of IAGC’s new Environment Group. She is a seasoned legal professional with years of experience working with government regulators in Alaska and Washington, D.C. In her new role, Nikki is responsible for monitoring new environmental regulations, directives and initiatives, coordinating IAGC’s review and response to such developments, and representing IAGC in joint industry regulatory management efforts.

Martin recently moved with her husband from Alaska where she worked as the Regulatory and Legal Affairs Manager at the Alaska Oil & Gas Association. Previously, Martin practiced as an associate attorney for an Anchorage-based law firm and also as a law clerk for the Anchorage Superior Court Judge and the Western Resources Legal Center. Martin’s prior legislative experience includes serving as legislative correspondent for U.S. Senator Ted Stevens and as legislative aide to Alaska State Legislature House Majority Leader and Senate President.

Martin received a Bachelor of Arts in Political Science from the University of South Carolina and a Juris Doctor from Lewis & Clark Law School. She is a member of the Alaska Bar Association.



Office Manager

Criss Rennie

Criss joined IAGC in 1991 after studying Business Management at Houston Community College.  Previously she had worked part-time for an insurance company while going to school. She signed on as Assistant to the President and remained as such until 1998 following the birth of her first child. At which time she continued with IAGC as Houston Office Manager. Her responsibilities include accounting, budgeting, personnel, employee benefits, insurance coverage, event planning, etc.

In addition, Criss directs all activities related to IAGC's annual fundraisers - the IAGC Golf Tournament, which is held every Spring and the IAGC Sporting Clays Tournament, which is held during the Fall.



Executive Assistant

Angela Verzal

Angela joined IAGC as the Executive Assistant to President, Chip Gill in April 2008.

Angela provides high level administrative support to the President of IAGC and directs a large portion of IAGC’s internal office operations. She is designated as primary support for the Office Manager and back-up support for customer service areas such as website management, database maintenance, event registration and publication orders. Angela coordinates all aspects of travel planning including visa and passport requirements. She directs exhibition booth management for IAGC at the Society for Exploration Geophysics Annual Meeting (SEG). Additionally, she organizes all activities related to other meetings including the IAGC Annual Meeting, quarterly executive committee meetings, quarterly board of directors meetings, bi-annual commercial health committee meetings and monthly staff meetings.

Prior to joining IAGC, Angela worked as the Executive Assistant to both the Chief Executive Officer and the President/Chief Operating Officer at Association Management, Incorporated (AMI – now known as FirstService Residential), a homeowner association management company.

Angela received an Associate of Science degree in paralegal studies and has attended several conferences tailored to administrative professionals with a focus on leadership, communication and organization.  She is currently pursuing a certificate in event planning.  She brings over eleven years of customer service experience to IAGC in addition to eight years of management experience and seven years as an executive assistant.

Website/ Database Administrator

Tim Fransioli
Tim joined the IAGC in January 2009 after moving back to Houston from Salt Lake City, UT where he had been both a Technical Account Agent and Project Lead for Good Mobile Messaging.

Tim’s responsibilities include assisting management and the processing of the membership database and directory, website maintenance, publications requests and its processes. If you have any questions or difficulties in accessing the IAGC website please don’t hesitate to contact Tim.

Administrative Assistant

Bianca Lopez

Bianca joined IAGC on August 2012. Bianca is currently a student at the University of Houston and pursuing a Bachelors of Science in Environmental Geosciences and Geology. Bianca has over six years of experience as an administrative assistant in the oil and gas field.

Bianca’s responsibilities include administrative support for Vice President of Projects & Issues, Walt Rosenbusch and Communications Director, Gail Adams.



Communications Specialist

Melissa Frederick

Melissa Frederick joined IAGC as the communications specialist in January 2014. She works in the communications and marketing department, dealing with media relations, corporate publications and newsletters, internal communications and management of the organization’s social media accounts. She also supports the Director of Communications, assists event planning, manages print publications and offers general office support.

Originally from Indiana, Melissa has been as an administrative assistant for the last seven years and worked as an editor and writer for the University Publication Corporation for seven years prior to that. She has been writing professionally for over 15 years and has a Bachelor’s Degree in English / Writing from Indiana University and Goshen College.



Administrative Assistant

Amber Davis

Amber Davis joined IAGC in January 2014 and serves as the Administrative Assistant for the Environment Group. Amber brings more than a decade of experience to IAGC, having worked as a paralegal for a Houston/Spring based law firm while earning her Associate of Applied Science in Paralegal Studies from San Jacinto College.  She is a member of the State Bar of Texas Paralegal Division.

Amber's extensive knowledge, experience and diverse skills in working for a solo practitioner make her uniquely qualified to assist Karen St. John-Group Vice President  and Nikki Martin- Director- Environmental Regulation & Legal Affairs in their duties at IAGC. 

Amber is well liked and respected by clients, vendors, co-workers and those within the industry.




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