Neil Gilbert Siegel (born February 19, 1954) is an American computer scientist, systems engineer, and engineer, known for his development of many key systems for the United States military, including the Blue-Force Tracking system, the U.S. Army's first unmanned air vehicle system, and the US Army forward-area air defense system. Several of his inventions also found their way into consumer products, such as hand-held devices (e.g., mobile GPS devices, smartphones, etc.) whose map displays automatically orient themselves to align with the real-world's cardinal points.