Dirk Kaesler (born 19 October 1944) is a German sociologist and Max Weber expert. Now retired, he was formerly Professor of Sociology at the University of Marburg. He is the author of Max Weber: An Introduction to his Life and Work, first published by the University of Chicago Press in 1988.

Maximilian Karl Emil "Max" Weber (German pronunciation: [ˈmaks ˈveːbɐ]; 21 April 1864 – 14 June 1920) was a German sociologist, philosopher, and political economist who profoundly influenced social theory, social research, and the discipline of sociology itself.

Weber was a key proponent of methodological antipositivism, presenting sociology as a non-empiricist field which must study social action through interpretive means based upon understanding the meanings and purposes that individuals attach to their own actions. Weber is often cited, with Émile Durkheim and Karl Marx, as one of the three principal architects of modern social science.

Weber's main intellectual concern was understanding the processes of rationalisation, secularization, and "disenchantment" that he associated with the rise of capitalism and modernity. Weber argued that the most important difference among societies is not how people produce things but how people think about the world. In Weber’s view, modern society was the product of a new way of thinking. Weber is perhaps best known for his thesis combining economic sociology and the sociology of religion, elaborated in his book The Protestant Ethic and the Spirit of Capitalism. Weber proposed that ascetic Protestantism was one of the major "elective affinities" associated with the rise of capitalism, bureaucracy and the rational-legal nation-state in the Western world. Against Marx's "historical materialism," Weber emphasised the importance of cultural influences embedded in religion as a means for understanding the genesis of capitalism. The Protestant Ethic formed the earliest part in Weber's broader investigations into world religion: he would go on to examine the religions of China, the religions of India and ancient Judaism, with particular regard to the apparent non-development of capitalism in the corresponding societies, as well as to their differing forms of social stratification.

Viktor Emil Frankl M.D., Ph.D. (March 26, 1905, Leopoldstadt, Vienna – September 2, 1997, Vienna)was an Austrian neurologist and psychiatrist as well as a Holocaust survivor. Frankl was the founder of logotherapy, which is a form of Existential Analysis, the "Third Viennese School of Psychotherapy". His best-selling book, Man's Search for Meaning (published under a different title in 1959: From Death-Camp to Existentialism, and originally published in 1946 as Trotzdem Ja Zum Leben Sagen: Ein Psychologe erlebt das Konzentrationslager), chronicles his experiences as a concentration camp inmate based on his psychotherapeutic method of finding meaning in all forms of existence, even the most sordid ones, and thus a reason to continue living. Frankl was one of the key figures in existential therapy and a prominent source of inspiration for humanistic psychologists.

Frankl was born in Vienna into a Jewish family of civil servants (Beamtenfamilie). His interest in psychology surfaced early. For the final exam (Matura) in Gymnasium, he wrote a paper on the psychology of philosophical thinking. After graduating from Gymnasium in 1923, he studied medicine at the University of Vienna and later specialized in neurology and psychiatry, concentrating on the topics of depression and suicide. His early development was influenced by his contacts with Sigmund Freud and Alfred Adler, although he would later diverge from their teachings.