David S. McKay(American Astrobiologist Best Known for Claiming to Have Found Evidence of Microscopic Life on a Martian Meteorite)

David S. McKay was a prominent figure in astrobiology, serving as the chief scientist for astrobiology at the Johnson Space Center. He played a significant role during the Apollo program by providing geology training to the astronauts who walked on the Moon. McKay is best known for being the first author of a groundbreaking scientific paper proposing the existence of past life on Mars based on evidence from the Martian meteorite ALH 84001, found in Antarctica. His work has had a lasting impact on planetary science and led to the establishment of the NASA Astrobiology Institute.