Stephen Rollnick is a South African-born clinical psychologist and co-founder of motivational interviewing, an approach that changed how professionals speak with people who feel uncertain about changing. Rather than treating reluctance as stubbornness or lack of insight, Rollnick helped develop…

William R. Miller is an American clinical psychologist whose work transformed the treatment of addiction and the broader psychology of behavioral change. He is best known for originating motivational interviewing, a collaborative conversational approach developed as an alternative to confrontation,…

Pierre Janet was a French philosopher, physician, psychologist, and psychotherapist whose research helped establish the modern study of dissociation, traumatic memory, subconscious activity, and psychological treatment. Before psychoanalysis became internationally dominant, he examined how overwhelming experiences could disrupt memory, perception,…

Daniel Goleman is an American psychologist, science journalist, and author whose work brought emotional intelligence into classrooms, workplaces, leadership programs, and everyday discussions of human ability. His 1995 bestseller Emotional Intelligence: Why It Can Matter More Than IQ challenged the…

John Mordechai Gottman is an American psychologist whose research transformed the scientific study of romantic relationships, marriage, communication, and emotional connection. For more than five decades, Gottman has examined why some couples build lasting, satisfying partnerships while others gradually drift…

Robert J. Sternberg is an American psychologist whose work transformed modern thinking about intelligence, creativity, wisdom, leadership, and love. Throughout a career spanning more than five decades, Sternberg has challenged narrow definitions of human ability, arguing that intelligence cannot be…

Erich Fromm was a German American social psychologist, psychoanalyst, philosopher, and public intellectual who sought to explain how society enters the human personality. He rejected the idea that individuals can be understood only through instincts, childhood conflicts, or private symptoms.…

Robert B. Cialdini is an American social psychologist whose work changed how researchers, businesses, public institutions, and ordinary people understand persuasion. Rather than portraying influence as a mysterious talent possessed by charismatic individuals, he showed that agreement often follows recurring…

Niccolò Machiavelli was a Florentine diplomat, historian, playwright, and political thinker whose name became synonymous with ruthless ambition. That reputation rests largely on a simplified reading of The Prince, a compact work about how rulers acquire, preserve, and lose power.…

Mihaly Csikszentmihalyi was a Hungarian American psychologist whose research changed how scholars understand happiness, creativity, motivation, and meaningful work. He is best known for developing the concept of flow, a state of deep involvement in which attention becomes organized around…

Marcel Proust was a French novelist, essayist, and critic whose writing transformed the representation of memory, identity, desire, and time. His monumental novel cycle, In Search of Lost Time, follows a narrator who gradually discovers that the apparently vanished past…

Charles Taylor is a Canadian philosopher whose work has reshaped debates about identity, freedom, morality, religion, language, and multiculturalism. Against theories that portray people as isolated decision-makers, Taylor argues that human beings become intelligible to themselves within languages, communities, histories,…