American Association of Petroleum Geologists
The American Association of Petroleum Geologists (AAPG) is one of the world's largest professional geological societies with more than 36,000 members as of 2013. The AAPG works to "advance the science of geology, especially as it relates to petroleum, natural gas, other subsurface fluids, and mineral resources; to promote the technology of exploring for, finding, and producing these materials in an economically and environmentally sound manner; and to advance the professional well-being of its members." The AAPG was founded in 1917 and is headquartered in Tulsa, Oklahoma; currently almost one-third of its members live outside the United States.
AAPG publishes the AAPG Explorer magazine and AAPG Bulletin scientific journal, and co-publishes a scientific journal with the Society of Exploration Geophysicists called Interpretation. The organization holds an annual meeting including a technical conference and exhibition, sponsors other conferences and continuing education for members around the world such as ongoing Geosciences Technology Workshops, and provides various other services to its members. The organization also includes divisions focused on particular aspects of the profession. These include the Division of Environmental Geosciences, Division of Professional Affairs, and the Energy and Minerals Division. The association membership has included Harrison "Jack" Schmitt, a U.S. astronaut who walked on the moon.