Paul Lazarsfeld (February 13, 1901 – August 30, 1976) was born in Vienna. Trained as a mathematician, he later developed quantifying methodologies for social research and established specialized institutes such as Columbia University's Bureau of Applied Social Research. Lazarsfeld was particularly interested in the effects of communication and mass media on society, especially voting behavior. His work on "opinion leaders" and public apathy due to information overexposure were particularly influential.