Epidemiologist and public health expert Mark Tyndall has dedicated his career to studying HIV, poverty, and drug use in multiple places around the world, starting with Nairobi, and now in Vancouver and Ottawa. An early advocate for harm reduction programs, Mark was at the forefront of North America’s first legally sanctioned supervised injection facility, INSITE, established in Vancouver in 2003. Since then, studies have shown that safe injection sites save lives, reduce transmission of disease and help people access addiction treatment and other medical services. A proponent of evidence-based public health policy and interventions, Mark has authored over 200 academic papers and has received several honors for his work. He is currently the Director of the British Columbia Centre for Disease Control.