- Sigmund Freud — The unconscious mind
- Carl Jung — Personality, archetypes and the unconscious
- Alfred Adler — Purpose, inferiority and human motivation
- William James — Consciousness and human experience
- Carl Rogers — Self-growth and human potential
- Abraham Maslow — Human needs and self-actualisation
- Viktor Frankl — Meaning and purpose in life
- Erik Erikson — Human development and identity
- Jean Piaget — Cognitive development
- B. F. Skinner — Behaviour and conditioning
- Ivan Pavlov — Learning and conditioning
- Albert Bandura — Self-belief and social learning
- Daniel Kahneman — Thinking, decisions and cognitive biases
- Aaron Beck — Thoughts, emotions and cognitive therapy
- Martin Seligman — Positive psychology and wellbeing
- Mihaly Csikszentmihalyi — Flow and optimal experience
- Rollo May — Anxiety, freedom and existential psychology
- John Bowlby — Attachment and relationships
- Mary Ainsworth — Attachment and human bonding
- Lev Vygotsky — Learning and social development
- Elizabeth Loftus — Memory and human perception
- Jonathan Haidt — Morality and human behaviour
- Carol Dweck — Mindset and personal growth
- Robert Cialdini — Influence and persuasion
- Paul Ekman — Emotions and facial expressions