Edward Diener is an American psychologist, professor, and author. He is noted for his research over the past twenty-five years on happiness — the measurement of well-being; temperament and personality influences on well-being; theories of well-being; income and well-being; and cultural influences on well-being. As shown on Google Scholar as of January 2014, Diener's publications have been cited over 76,000 times.
For his fundamental research on the subject, Diener is nicknamed Dr. Happiness. He has worked with researchers Daniel Kahneman and Martin Seligman — and he is a senior scientist for the Gallup Organization.