John M. Zelenski is a Professor of Psychology at Carleton University in Ottawa, Canada. As a researcher and director of the Carleton University Happiness Laboratory, he studies individual differences in happiness, and how personality manifests itself 'in the moment' as emotional, behavioural, and cognitive processes. John's recent work has focused on two areas: the causes and consequences of social behaviour (e.g., in relation to the personality trait of introversion-extraversion), and the links among nature, people's sense of connection to nature (nature relatedness), happiness, and environmentally sustainable behaviour. John also teaches on a range of Personality, Social and Positive Psychology courses at Carleton.