Arun is an Assistant Professor at USC in the Center for Genetic Epidemiology, the Department of Population and Public Health Sciences, and the department of Quantitative and Computational Biology. His research has appeared in Nature, Science, PNAS and other journals. He is a recipient of the Outstanding Investigator Award from the National Institute of Health. His writing has appeared in The Conversation. He also contributes humor and cartoons to The American Bystander, The Times of London, The Weekly Humorist and others.