Short answers, pulled from the story.
Jeff Greenberg, Sheldon Solomon, and Tom Pyszczynski codified the theory in the early 1980s. They expanded anthropologist Ernest Becker's philosophical observations from his 1973 book The Denial of Death into testable psychological hypotheses.
The theory posits that humans possess a powerful instinct to preserve their lives while simultaneously knowing with certainty that death is inevitable. This conflict generates profound terror that most people feel only subconsciously until they rely on cultural worldviews for management.
In one early study from 1990, Jeff Greenberg asked Christian students to evaluate Jewish peers after reminding them of their own mortality. Those reminded of death rated fellow Christians more positively and Jewish students more negatively than control groups before self-esteem was bolstered.
Crisis events trigger preferences for strong leaders because citizens seek an antidote to existential concerns through political figures during times of fear. Research shows participants choose charismatic leaders over task-oriented or relationship-oriented ones when mortality is salient.
A massive replication effort known as Many Labs 4 failed to reproduce key findings among 2,200 participants across 21 U.S. labs. The results did not replicate the worldview defense under any condition despite Tom Pyszczynski's criticism regarding sample sizes and protocol deviations.