Martin Seligman talks about psychology -- as a field of study and as it works one-on-one with each patient and each practitioner. As it moves beyond a focus on disease, what can modern psychology help us to become?

Martin Seligman is the founder of positive psychology, a field of study that examines healthy states, such as happiness, strength of character and optimism.

Shawn Achor is the CEO of Good Think Inc., where he researches and teaches about positive psychology.

Mihaly Csikszentmihalyi has contributed pioneering work to our understanding of happiness, creativity, human fulfillment and the notion of "flow" -- a state of heightened focus and immersion in activities such as art, play and work.

Psychologist Angela Duckworth studies the traits that allow us to stick to our goals — and she chose four great talks that explore other facets of how human beings behave.

We believe we should work hard in order to be happy, but could we be thinking about things backwards? In this fast-moving and very funny talk, psychologist Shawn Achor argues that, actually, happiness inspires us to be more productive.

Our culture is obsessed with happiness, but what if there's a more fulfilling path? Happiness comes and goes, says writer Emily Esfahani Smith, but having meaning in life -- serving something beyond yourself and developing the best within you -- gives you something to hold onto. Learn more about the difference between being happy and having mean...

In the face of artificial intelligence and machine learning, we need a new radical humanism, says Tim Leberecht. For the self-described "business romantic," this means designing organizations and workplaces that celebrate authenticity instead of efficiency and questions instead of answers. Leberecht proposes four (admittedly subjective) principl...

These TED Talks will help you conjure up massive amounts of gratitude.

How to be happier at work? Start by focusing on happiness -- not, surprisingly, on work. We learned this fun fact from Shawn Achor's TED Talk. So we asked Achor to choose some more talks he loves, about making work and life a happier place.

After watching the collection of talks on Understanding Happiness, read a thoughtful recap of the major points in this TED Study, and learn where experts believe things are headed.

TED Studies, created in collaboration with Wiley, are curated video collections — supplemented by rich educational materials — for students, educators and self-guided learners. In Understanding Happiness, expert explorers of the mind chart our understanding of how happiness is created and cultivated. Their insights challenge our most basic cultu...