Khalid Mubarak Bindayna, PhD, is a professor of microbiology with 30 years of experience in teaching in PBL and received a Ph.D. in microbiology from the Imperial College of Medicine in London. Bindayna has published over 30 articles in peer-reviewed medical journals, including The Lancet.Jameela Al-Salman, PhD, is an associated professor of infectious diseases with 20 years of experience in teaching in PBL. Salman has earned an MD in medicine, is an American board–certified infectious diseases specialist, and is a consultant of infectious diseases. She has published over 30 articles in peer-reviewed medical journals.