His goal was to understand how people’s attitudes change in response to the existential threat of acts of terror, which he explored through textual analyses of more than 2.5 million tweets between 2016 and 2018. This period included the shooting at the Pulse nightclub in Orlando, Florida, in June 2016, the shooting at Florida’s Fort Lauderdale Airport in January 2017 and the bombing of the Manchester Arena in May 2017.