Born: 1919Birthplace: New Haven, Conn. High-voltage, high-power semiconductor pin rectifier—Hall's invention boosted efficiency and reduced wasted power and destructive heat build-up in large-scale…
Born: 1926Birthplace: New York City Diagnostic x-ray systems—Ledley developed the ACTA diagnostic x-ray scanner, the first whole-body computerized tomography (CT) machine. He was the first to do…
Born: 1927Birthplace: Iowa Semiconductor device-and-lead structure—Noyce, as research director of Fairchild Semiconductor, was responsible for the initial development of silicon mesa and planar…
Born: 1922Birthplace: Boston, Mass. High resolution-image-scanning radar and sonar—Rines' radar and sonar inventions have been used by the military in the Persian Gulf War. In peacetime they have…
Born: 1936Birthplace: Santa Monica, Calif. Field-effect device with insulated gates—Also known as the Self-Aligned Gate MOSFET (metal oxide semiconductor field effect transmitter). Patented in 1969…
Born: 1932Birthplace: Terrell, Tex. One-transistor dynamic random access memory—Dr. Dennard's invention of DRAM, most often called RAM, was a core development in today's computer industry and is…
Congressional delegate Underwood holds bachelor's and master's degrees in history from California State University, and a Ph.D. in education in policy planning from UCLA. In 1972 he became a…
science teacherBorn: 2/3/1953Birthplace: Norfolk, Va. Roberts was a seventh grade life science teacher at the W.E. Waters Middle School in Portsmouth, Va., from 1975 until 2004 when she moved to…
Union general Born: 6/11/1816Birthplace: near Salem, Ind. Born on a farm in southern Indiana, Milroy attended a private military academy in Vermont, graduating in 1843. He served as a company…
