Landmark OGM maintains a wide range of important relationships that facilitate our ability to address issues effectively on behalf of our clients. These include the following:

Trade Groups/Organizations

  • American Association of Petroleum Landmen
  • American Petroleum Institute
  • Denver Association of Petroleum Landmen
  • Houston Association of Petroleum Landmen
  • IRWA (International Right of Way Association)
  • IPAA (Independent Petroleum Association of America)
  • Rocky Mountain Mineral Law Foundation
  • State Bar of Texas
  • Other State and Local Landman Associations


Federal, Tribal, and State Governmental Agencies

  • Bureau of Indian Affairs
  • Bureau of Land Management
  • Native American Tribal Governments
  • US Army Corp of Engineers
  • US Forest Service
  • US Fish and Wildlife Service
  • US National Park Service
  • Numerous State Regulatory Agencies