Who among the following is NOT a member of the Frankfurt School?

The correct option is Louis Althusser.

Step-by-step Explanation:

1. Understanding the Frankfurt School:
The Frankfurt School, officially known as the Institute for Social Research (Institut für Sozialforschung), was founded in Frankfurt, Germany, in 1923. It is famous for developing "Critical Theory," which combines Marxist analysis with psychoanalysis, philosophy, and sociology to critique modern capitalist society, culture, and authority.

2. Identifying Frankfurt School Members:
- Max Horkheimer was a key figure and director of the Institute, who helped define Critical Theory.
- Theodor Adorno was a leading philosopher, sociologist, and musicologist of the school, co-authoring the seminal work Dialectic of Enlightenment with Horkheimer.
- Herbert Marcuse was another prominent member of the first generation of the Frankfurt School, famous for works like One-Dimensional Man.

3. Analyzing the Correct Answer (Louis Althusser):
Louis Althusser (1918–1990) was a highly influential French Marxist philosopher. However, he was associated with Structural Marxism (structuralist philosophy) rather than the Frankfurt School. Althusser worked primarily at the École Normale Supérieure in Paris and proposed a structural reading of Karl Marx that was distinct from, and often critical of, the humanist interpretations of Marxism advocated by many thinkers of the Frankfurt School.

Therefore, Louis Althusser is NOT a member of the Frankfurt School.