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David M. L. Sills is a Canadian academic and meteorologist, and is the Executive Director of the Northern Tornadoes Project at the University of Western Ontario.

Education and Career
He obtained a BSc and Certificate of Meteorology in 1993 and a PhD in Atmospheric Science in 1998, all from York University.

He worked as a severe weather scientist with Environment and Climate Change Canada in Toronto from 1998 to 2019. In April 2019, he joined the University of Western Ontario in London, Ontario as Executive Director of the Northern Tornadoes Project, a research group co-founded with Greg Kopp and the support of social impact fund ImpactWX.

Research
He has contributed to research to improve the understanding of Canadian tornadoes and participated in the American VORTEX2 tornado field study. He led teams that developed a new national tornado climatology for Canada as well as the Canadian implementation of the Enhanced Fujita Scale for wind damage rating. With the Northern Tornadoes Project, he leads the effort to detect, assess and document all tornadoes that occur in Canada.

He has also studied mesoscale weather phenomena such as lake-breeze circulations and their influence on severe thunderstorms and hazardous air pollution, and co-led several related Canadian field studies including ELBOW 2001, BAQS-Met 2007, UNSTABLE 2008 and ECPASS 2015.

He and his work have been featured on TV and radio, and in newspapers, magazines, and podcasts, in Canada and the United States.

Awards
He won the CMOS Rube Hornstein Medal in Operational Meteorology in 2016.