As an environmental analytical chemist by training, my research is in the areas of (i) fate, transformation and speciation of contaminants in environment, (ii) characterizing and quantifying biomarkers for human exposure to toxic chemicals, (iii) biomonitoring and body burden, and (iv) individual/community exposure and health risk assessment. My laboratory experience in quantitative analysis of small molecules, lipids, and peptides is accomplished by employing LC-MS/MS, QTOF-LC/MS and GC-MS/MS.