He specializes in large dataset manipulation, data linkage and epidemiological studies of many chronic diseases (cancer, asthma, COPD, chronic renal disease, and quality of life) and infectious diseases (Tuberculosis). He uses many registry and administrative datasets to study TB transmission, effectiveness of chemotherapy and radiotherapy on cancer patients, and timeliness of care of cancer patients. He has experience in analyzing many Canadian health survey datasets including Canadian National Longitudinal Survey of Children and Youth (NLSCY), Canadian Community Health Survey (CCHS), and Canadian General Social Survey (GSS) and Aboriginal Population Survey (APS). He is also involved in many large population studies of gene-gene and gene-environment interactions in occupational respiratory diseases.