The ONHPO is responsible for consultations, investigations, and planning efforts in relation to the following: the National Historic Preservation Act (NHPA), the National Environmental Protection Act (NEPA), the Archaeological Resources Protection Act (ARPA), the Native American Graves Protection and Repatriation Act (NAGPRA), the four Oklahoma Statutes protecting human remains, and Osage laws concerning archaeological and heritage resources. The Tribal Historic Preservation Officer (THPO) assists in the identification, documentation, and protection of Osage archaeological and historic properties within the Osage Nation Reservation and throughout Osage ancestral lands. A network of elders and partners collaborate to ensure that the full spectrum of archaeological and historic properties threatened by proposed federal undertakings or other forces are identified and receive culturally appropriate documentation and treatment. All prospective threats to Osage culture or the reservation’s archaeological and historic resources receive coordinated responses through consultations, research, and investigations centered in the ONHPO.