Donald Ellis Hudson

Donald Ellis Hudson (February 25, 1916 – April 24, 1999) was an American earthquake engineer and academic. He was a professor at the California Institute of Technology in the Division of Engineering and Applied Science (1943-1981), where he performed pioneering research in ground motion measurement and analysis, and response of structures to earthquake excitation. Hudson developed or co-developed a number of instruments used in the study and analysis of seismic motions. With Thomas K. Caughey he developed the Mark II response spectrum analyzer in the late 1950s, and then worked with Lehner & Griffith Company (which was acquired by United Electro Dynamics Inc.) to develop the AR-240 accelerograph, the first “off-the-shelf” commercially available accelerograph. He was elected in 1973 to the National Academy of Engineering "For the development of widely used instruments to record destructive earthquake ground shaking".