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I'm Emily Campaniel, and this is the Fox True Crime podcast.

Thank you. True Crime Podcast. What could possibly drive a person to commit mass murder?

With such a heinous, evil crime, it's difficult to understand any motivations that exist within the perpetrator's mind that ultimately lead them to carry out violence on such a devastating level.

However, by collecting data and information and examining the patterns of these crimes, experts can paint a picture of the factors that play a role in these

crimes. Dr. Raggy Gerges is a professor of clinical psychiatry at the Columbia University

Department of Psychiatry and New York State Psychiatric Institute. He is also the curator of the

Columbia Mass Murder Database. Today, he joins me with a look inside his research to discuss what's

behind mass murders and how they can be prevented. Dr. Gerges, tell me about your research

with the Columbia Mass Murder Database.

I'm a schizophrenia researcher and I focus on violence and psychosis. One of the questions

we really wanted to answer was, what

is the relationship, if any, between mental illness and primarily that means psychosis and mass shootings?

To do that, we really wanted to use evidence, the way we would examine any other question and

research. So what we've decided to do was put together a database that includes all mass

murders that we could find perpetrated since 1900 all over the world. Now, we should probably

define what a mass murder is. So the congressional definition of a mass murder is three

...