Karen Delise, Founder and Director of Research, has been investigating fatal dog attacks since 1990. She is the author of two books, Fatal Dog Attacks: The Stories Behind the Statistics and The Pit Bull Placebo: The Media Myths and Politics of Canine Aggression.[38][1] Her data set extends back to the 19th century. Delise refuses to rely only on news accounts, as she and other researchers have found them to be untrustworthy, in and of themselves.[39][2] Rather, she has obtained official documents whenever they are available. She has interviewed police investigators, animal control officers and, medical examiners.[40][3] According to her results, the overwhelming majority of dogs involved in human fatalities, irrespective of breed or type, were not dogs which had been afforded the opportunity to interact with humans on a daily basis and in positive and humane ways. They were dogs obtained and kept as other than pets. Most were also poorly managed and controlled.[41][4] Any single-vector study of serious and fatal attacks will overlook the critical circumstances in these incidents that have remained constant over the decades, even as the breeds identified in attacks have changed.