Q. Rudolf E. Kalman was famous for __?
Answer: As a Hungarian-American electrical engineer
Notes: Rudolf E. Kalman was a Hungarian-American electrical engineer, mathematician, and inventor. He is most noted for his co-invention and development of the Kalman filter, a mathematical algorithm that is widely used in signal processing, control systems, and guidance, navigation and control. For this work, U.S. President Barack Obama awarded Kalman the National Medal of Science on October 7, 2009.