Teo is a critical-theoretical psychologist who employs metatheory and history to provide a more reflexive understanding of the foundations and trajectories of current psychology while projecting alternatives to the status quo. His research has argued for psychology becoming a self-reflexive discipline that provides disciplinary and social interventions.
Critique of psychology
Teo has contributed to critical-theoretical work since his early publications on the history of GermanCritical Psychology, broadening the concept of critical psychology, integrating various streams of critical thought, including feminism, postcolonialism, social constructionism, political theory, indigenous psychology, and hermeneutics, that were applied to ontological, epistemological, ethical, and more recently aesthetic contexts of psychology. Significant critiques of psychology were investigated in The Critique of Psychology: From Kant to Postcolonial Theory, which was the first book to provide a systematic history of the critique of psychology. As an international leader of critical psychology he edited the Encyclopedia of Critical Psychology. In 2015 he summarized the status of critical psychology in the flagship journal of the APA the American Psychologist.
An important critical project that Teo pursued was the study of racism and scientific racism, some of which was published in German. He worked on racism and mixed race and in a series of articles advanced the meaning of the concept of epistemological violence in empirical research. Epistemological violence is committed when interpretations of empirical data implicitly or explicitly constitute the Other as inferior or problematic, despite the fact that alternative interpretations, equally viable, based on the same results, are available.
Critical history
Teo’s historical work has drawn on history, with history as a means and not as an end. Connecting the philosophy of psychology with the history of psychology he co-authored A Critical History and Philosophy of Psychology: Diversity of Context, Thought, and Practice''. Several historical studies focused on twin research, the history of critical psychology, and the history of German psychology.
Teo supports the idea of critical psychology as a generative and international movement that provides reflexivity and interference in psychosocial affairs. His latest book Outline of Theoretical Psychology: Critical Investigations discusses basic philosophical problems in the discipline and profession of psychology. By engaging with basic theoretical problems, Teo demonstrates how psychology can avoid its pitfalls and participate as a force for resistance and the good. To do so, Teo has made the argument that psychology needs to draw on the psychological humanities to understand human mental life. He has argued that the development of psychology as a science and the struggle for scientific recognition has disrupted the need to interrogate the discipline and the profession from the critical perspective of the humanities, the arts, and the concept-driven social sciences.