My research focuses on an extensive range of health issues and populations, spanning the life course and domestic and international contexts (primarily the US and Canada, but other international locations as well). A substantial focus of my research program investigates social, behavioral, attitudinal, and policy factors underlying vaccination uptake and coverage (and refusal or delay) in the US and Canada, and beyond. Some examples from my past and current projects include early child development, child undernutrition in India, adolescent HPV vaccination, smoking and alcohol use among adults, body mass index among Danish women, substance use and sexual risk among gay men in the city of New York, fruit and vegetable intake among older adults, and life expectancy/mortality risk among high status individuals.