Dr. Mark Loeb is internationally recognized in the field of infectious diseases clinical trials and epidemiological studies. He is distinguished for his original work on influenza vaccination and herd immunity in Canadian Hutterite communities and for pivotal work on respiratory mask protection against influenza. This work has been recognized by international infectious disease societies as influential. Dr. Loeb has led pioneering clinical trials on prevention and management of infections in the frail elderly. He has developed international research networks and has served on national and international advisory committees. His work has had global impact on policy and practise.