Paul Lazarsfeld is one of the founders of the field of empirical social research. He gained recognition in the development of data collection and analysis. He pioneered market surveys and public opinion polls and founded mass media research, as well as communication research. He examined ideology leaders, interpersonal communication, unemployment, election preferences formation, as well as threats to academic liberties. This book presents Paul Lazarsfeld's work in a unique way, in all of the above mentioned fields of applied social research. It consists of three parts - biography, an overview of methods and survey strategies, with which Lazarsfeld enriched modern methodology, and chapters devoted to his most famous surveys of media, unemployment and election behaviour. The book is published in English. Web obalkyknih.cz