Our Alliances

We have formed alliances with several industry-leading, recognized, and respected organizations to better support our clients. Our alliance partners provide our clients with not only a deep understanding of the IGEN system, but also many years of Motor Fuel Excise Tax Compliance experience. Their deep industry knowledge, combined with the advanced technical tools the IGEN system provides, gives our clients a platform that will ensure their accurate and successful filing.

Thomson Reuters

Thomson Reuters ONESOURCE Indirect Tax offers end-to-end global software solutions and consulting services to help manage the entire indirect tax management life cycle in over 15,800 taxing authorities and more than 190 countries.  The Thomson Reuters Indirect Tax solution is deployed on-premise or in the cloud to accommodate Oil & Gas companies of all sizes.  Thomson Reuters is the world’s leading source of news and information for professional markets. Our customers rely on us to deliver the intelligence, technology and expertise they need to find trusted answers, for more than 100 years.

Mike Tierney

Senior Director, Operations

Office: (651) 687-7678



An award-winning global tax services firm, Ryan provides a comprehensive range of state, local, federal, and international tax advisory and consulting services on a multi-jurisdictional basis. Areas of expertise include audit defense, tax recovery, credits and incentives, tax process improvement and automation, tax appeals, tax compliance, and strategic planning.

Bob Jones

Office:  (913) 338-2005

Mobile:  (913) 269-4915


Robert Donnellan

Office:  (401) 272-3363 ext. 33-1033

Mobile:  (508) 404-3315


Tax Advisory Service Group

Tax Advisory Services Group provides a comprehensive range of state, local, and federal tax advisory and consulting services for the Oil & Gas Industry, specializing in motor fuel tax compliance and reporting, audit defense, tax recovery, tax process improvement and automation, tax appeals, and strategic planning.

Oscar Garza

Office: (713) 572-1993

Mobile: (832) 758-9034


Khristine Espinoza

Office: (713) 893-0691

Mobile: (832) 830-1996



WG is a full-service energy consulting firm that utilizes world-class methodologies to deliver value-creating solutions that meet each client’s unique operational needs. Our depth in the energy sector has made us a trusted advisory source for clients ranging from high-growth emerging companies to the Fortune 500. We’re here to build excellence.

Jill Patton

Managing Director

Office: (832) 581-4962

Mobile: (713) 822-1679

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