- Personality Assessment
- Rorschach Methodology
- Wartegg Methodology
- PAI - Personality Assessment Inventory
- Forensic Psychology/Psychiatry: Forensic Evaluations
- Psychometrics, Meta-analysis
- Private Military Contractors (PMC, PSD; Bodyguards, Mercenaries)
- Personality Models (Factor Models, Motivation, Diagnostics)
- The History of Psychology: Philosophical Background
- Psychoanalytic and Existentialistic Theory on Motivation and Meaning
- The Norwegian Philosopher Peter Wessel Zapffe
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