external In the Media May 17, 2022 Kenneth Gray, senior lecturer of criminal justice, homeland security, and investigative services, discusses the 'great replacement theory' and why it was part of a manifesto written by the individual accused of a mass shooting in Buffalo, New York. https://www.ktvu.com/news/the-great-replacement-theory-has-a-long-history-to-americas-past kenneth-gray news-all news-in-the-media year-2022 month-may name-kenneth-gray