In the fifth episode of Frontiers in Health & Happiness, we speak with Dr. Ichiro Kawachi, John L. Loeb and Frances Lehman Loeb Professor of Social Epidemiology here at the Harvard T.H. Chan School of Public Health, where he has taught for more than 30 years. Dr. Kawachi discusses the correlation between loneliness and socioeconomic status and race, his involvement with the World Health Organization’s new Commission on Social Connectedness, and his advice for finding happiness.