Philip Schneider (1947–1996) was an American who, in a series of public lectures in 1995, presented himself as a former government geologist and structural engineer who had helped build deep underground military bases. His central claim was that he was one of only three survivors of a 1979 clash between US forces and grey aliens at a secret base beneath Dulce, New Mexico. No record has supported that account or his professional credentials, and researchers who examined it concluded that it retold a story already in circulation. He passed away in January 1996.

Schneider was born on April 23, 1947, the son of Oscar Schneider, a US Navy medical officer. In his lectures, including a May 1995 talk in Post Falls, Idaho, he said that in 1979 he was working for the contractor Morrison-Knudsen on an extension of the Dulce base, checking rock and recommending explosives, when the crew broke into a cavern occupied by aliens. He said 67 workers and soldiers were killed in the fighting that followed and that an alien weapon had scarred his chest. He also claimed a "Rhyolite-38" security clearance, described a 1954 treaty between the government and the aliens, and said stealth technology came from crashed alien discs. Other claims went beyond UFOs, including that his father had taken part in the Philadelphia Experiment and that a nuclear device was used in the 1993 World Trade Center bombing.

The Dulce story predates Schneider's lectures. It grew in the early 1980s from the beliefs of the Albuquerque businessman Paul Bennewitz, who wrote in 1981 of a 1979 conflict at an alien base near Dulce. The Air Force agent Richard Doty later said he had been tasked with feeding false information to researchers, Bennewitz among them, and the aviator John Lear was promoting the base story by 1987. Greg Valdez, whose book drew on the case files of his father, the New Mexico police officer Gabe Valdez, found no evidence for Schneider's claimed engineering and geology background and concluded that his Dulce story "is not credible." The New Mexico researcher Norio Hayakawa has said Schneider had no verifiable degrees, never held the clearance he described and borrowed his material from Bennewitz, Lear and Bob Lazar. Skeptics and many UFO researchers alike have rejected his account.

In 2026, recordings of his 1995 lectures circulated widely again: full talks on underground bases, clips about what he called the alien agenda and cattle mutilations, and an interview in which his former wife, Cynthia Drayer, told his story were reposted repeatedly on Reddit and X. In October, after David Grusch gave a new interview to Joe Rogan, some accounts asked whether his remarks supported Schneider's claims of an underground war among alien factions.

Three decades after his passing, Schneider remains the best-known voice of the Dulce firefight story, chiefly because he told it as a first-person survivor. His lectures gave a legend assembled in the 1980s a human face and a casualty count, yet no public record or other survivor has placed him, or anyone else, in a battle at Dulce.