
Shawn Achor is an American author, and speaker known for his advocacy of positive psychology. He authored The Happiness Advantage and founded GoodThink, Inc.

Dan Ariely is an Israeli-American professor and author. He serves as a James B. Duke Professor of psychology and behavioral economics at Duke University. Ariely is the founder of the research institution The Center for Advanced Hindsight, co-founder of the companies Kayma, BEworks, Timeful, Genie and Shapa., the Chief Behavioral Economist of Qapital and the Chief Behavioral Officer of Lemonade. Ariely's TED talks have been viewed over 15 million times. Ariely is the author of the three New York Times best sellers Predictably Irrational, The Upside of Irrationality, and The Honest Truth about Dishonesty, as well as the books Dollars and Sense, Irrationally Yours – a collection of his popular The Wall Street Journal advice column “Ask Ariely”; and Payoff, a short TED book. Ariely appeared in several documentary films, including The Inventor: Out for Blood in Silicon Valley and produced and participated in (Dis)Honesty: The Truth About Lies. In 2018 Ariely was named one of the 50 most influential living psychologists in the world.

Albert Bandura is a Canadian-American psychologist who is the David Starr Jordan Professor Emeritus of Social Science in Psychology at Stanford University.

Tal Ben-Shahar born 1970, is an American and Israeli teacher, and writer in the areas of positive psychology and leadership. As a lecturer at Harvard University, Ben-Shahar created the most popular course in Harvard's history. He has subsequently written several best-selling books and in 2011 co-founded Potentialife with Angus Ridgway, a company that provides leadership programs based on the science of behavioral change to organisations, schools and sports organisations globally.

Daniel Cordaro is an American research scientist and psychologist who specializes in emotion psychology and human wellbeing. As a former faculty member at Yale University, Cordaro is best-known for his research in human emotion and positive psychology. Formerly the director of the Universal Expression Project at the University of California, Berkeley, Cordaro has conducted various worldwide studies on human emotional expression.

Mihaly Csikszentmihalyi is a Hungarian-American psychologist. He recognised and named the psychological concept of flow, a highly focused mental state conducive to productivity. He is the Distinguished Professor of Psychology and Management at Claremont Graduate University. He is the former head of the department of psychology at the University of Chicago and of the department of sociology and anthropology at Lake Forest College.

Kazimierz Dąbrowski was a Polish psychologist, psychiatrist, and physician. He is best known for his theory of "Positive disintegration", as a stage in personality development. He was also a poet and used the pen name of "Paul Cienin/Paweł Cienin".

Carol Susan Dweck is an American psychologist. She is the Lewis and Virginia Eaton Professor of Psychology at Stanford University. Dweck is known for her work on the mindset psychological trait. She taught at Columbia University, Harvard University, and the University of Illinois before joining the Stanford University faculty in 2004. She is a Fellow of the Association for Psychological Science.

David B. Feldman, Ph.D. is an Associate Professor of psychology at Santa Clara University. His research focuses on hope, meaning, and growth in the face of life's difficulties, and he has been instrumental in developing Hope Therapy and applying it to various populations.

Barbara Lee Fredrickson is an American professor in the department of psychology at the University of North Carolina at Chapel Hill, where she is the Kenan Distinguished Professor of Psychology. She is also the Principal Investigator of the Positive Emotions and Psychophysiology Lab (PEPLab) at the University of North Carolina at Chapel Hill.

Jonathan David Haidt is an American social psychologist, Professor of Ethical Leadership at New York University Stern School of Business, and author. His main areas of study are the psychology of morality and moral emotions.

Robert Holden is a British psychologist, author, and broadcaster, who works in the field of positive psychology and well-being. He is the founder of the "Happiness Project", which runs an eight-week course annually, called "Happiness Now", and the author of 10 best-selling books such as, Happiness NOW!, Be Happy, Success Intelligence and Shift Happens!. He runs the National Health Service (NHS) Stress Buster clinic, established first NHS "laughter clinic", and runs regular happiness workshops and seminars, with clients including employees of the NHS, the BBC and British Telecom.

Daniel Kahneman is an Israeli psychologist and economist notable for his work on the psychology of judgment and decision-making, as well as behavioral economics, for which he was awarded the 2002 Nobel Memorial Prize in Economic Sciences. His empirical findings challenge the assumption of human rationality prevailing in modern economic theory.

Scott Barry Kaufman is an American humanistic psychologist, author, podcaster, and popular science writer. His writing and research focuses on intelligence, creativity, and human potential. Most media attention has focused on Kaufman's attempt to redefine intelligence.

Dacher Keltner is a professor of psychology at University of California, Berkeley, where he directs the Berkeley Social Interaction Lab. He is also the founder and faculty director of the Greater Good Science Center. and host of the podcast The Science of Happiness.

Melanie Klein was an Austrian-British author and psychoanalyst known for her work in child analysis. She was the primary figure in the development of object relations theory. Klein suggested that pre-verbal existential anxiety in infancy catalyzed the formation of the unconscious, resulting in the unconscious splitting of the world into good and bad idealizations. In her theory, how the child resolves that split depends on the constitution of the child and the character of nurturing the child experiences; the quality of resolution can inform the presence, absence, and/or type of distresses a person experiences later in life.

Averil Leimon is an author, executive coach, leadership psychologist and was one of the first UK-based psychologists qualified in the academic field of positive psychology. Leimon is the joint editor of The Essential Coaching Series from academic publisher Routledge and is co-author of Essential Business Coaching and Coaching Women to Lead. She is also the co-author of Positive Psychology for Dummies and Performance Coaching for Dummies and the author of 100 lessons on happiness in 100 words or less.

Sonja Lyubomirsky is an American professor in the Department of Psychology at the University of California, Riverside and author of the bestseller The How of Happiness: A Scientific Approach to Getting the Life You Want, a book of strategies backed by scientific research that can be used to increase happiness.

Abraham Harold Maslow was an American psychologist who was best known for creating Maslow's hierarchy of needs, a theory of psychological health predicated on fulfilling innate human needs in priority, culminating in self-actualization. Maslow was a psychology professor at Alliant International University, Brandeis University, Brooklyn College, New School for Social Research, and Columbia University. He stressed the importance of focusing on the positive qualities in people, as opposed to treating them as a "bag of symptoms". A Review of General Psychology survey, published in 2002, ranked Maslow as the tenth most cited psychologist of the 20th century.

Martin Elias Pete Seligman is an American psychologist, educator, and author of self-help books. Seligman is a strong promoter within the scientific community of his theories of positive psychology and of well-being. His theory of learned helplessness is popular among scientific and clinical psychologists. A Review of General Psychology survey, published in 2002, ranked Seligman as the 31st most cited psychologist of the 20th century.

Colin Henry Wilson was an English writer, philosopher and novelist. He also wrote widely on true crime, mysticism and the paranormal, eventually writing more than a hundred books. Wilson called his philosophy "new existentialism" or "phenomenological existentialism", and maintained his life work was "that of a philosopher, and (his) purpose to create a new and optimistic existentialism".

Donald Woods Winnicott was an English paediatrician and psychoanalyst who was especially influential in the field of object relations theory and developmental psychology. He was a leading member of the British Independent Group of the British Psychoanalytical Society, President of the British Psychoanalytical Society twice, and a close associate of Marion Milner.

Paul T. P. Wong is a Canadian clinical psychologist and professor. His research career has gone through four stages, with significant contributions in each stage: learning theory, social cognition, existential psychology, and positive psychology. He is most known for his integrative work on death acceptance, meaning therapy, and second wave positive psychology. He has been elected as a fellow for both the American Psychological Association and the Canadian Psychological Association.