current applied work includes: energetics and cancer, long-term mental health outcomes from children's exposure to war, pediatric head trauma, analysis of mouse models, and molecular models of sickle cell disease. he also contributes to gene-wide associate studies (gwas) that seek to discover correlated cancer genes related to obesity, diet, and exercise, as well as consult on computational genetics analysis. other work includes bayesian hierarchical models, markov chain monte carlo theory, bureaucratic behavior in national security agencies, and issues in political epidemiology. his best known works include "essential mathematics for political and social research", with cambridge university press, and the third edition of "bayesian methods for the social and behavioral sciences" (chapman & hall/crc), which is the leading bayesian text for these disciplines. he is the author of seven other books. his journal work has appeared in the quarterly journal of political science, journal of the royal statistical society, journal of politics, electoral studies, statistical science, political research quarterly, sociological methods & research, public administration review, journal of public administration research and theory, canadian journal of political science, journal of statistical software, political analysis, lancet neurology, american journal of epidemiology, journal of urology, and others.