Abdul Arif Khan is working as Associate Professor (Microbiology) in College of Pharmacy, King Saud University, Riyadh, KSA. Dr. Khan's work involves evaluation of the role of microbes in cancer mainly the role of microflora in the etiology of colorectal cancer. He is using cancer system biology-based approaches to evaluate the influence of microbes in cancer etiology. He has published a number of books, research and review article relevant to the role of microbes in cancer etiology and prevention. He is also involved in anticancer and other biological activities evaluation of nanoformulations. He has been an invited speaker at several international conferences and given talks on the role of microbes in cancer etiology, prevention, and diagnosis.