Dr. Sills received a BSc in Atmospheric Science and Certificate in Meteorology from York University in 1993, as well as a PhD in Atmospheric Science from York University in 1998.
He worked for more than 20 years as a severe weather scientist with Environment Canada, conducting research on Canadian tornadoes, severe weather nowcasting and mesoscale meteorology. He was awarded the CMOS Rube Hornstein Medal in Operational Meteorology and the Geoff Howell Citation of Excellence for Innovation.
As Executive Director of the Northern Tornadoes Project, he oversees the detection, assessment, and documentation of tornadoes across Canada and conducts tornado-related meteorological and climatological research.
Dr. Sills serves as Associate Editor for the journals Atmosphere-Ocean and Monthly Weather Review. He is also a member of the ASCE Wind Speed Estimation in Tornadoes Committee charged with updating the EF-scale, and recently completed a four-year term on the WMO's Nowcasting and Mesoscale Research Working Group.