Silvia Pettem is a Colorado-based historical researcher, newspaper columnist, and author of more than a dozen books, including Someone's Daughter: In Search of Justice for Jane Doe (Rowman & Littlefield/Taylor Trade, 2009). Pettem is also a Cold Case instructor in classes sponsored by the Colorado Bureau of Investigation, a former advisory board member of the organization Families of Homicide Victims and Missing Persons, and a Medal of Honor recipient of the Vidocq Society. In addition, she works (as a volunteer) on unsolved missing persons cases in the Detectives Section of the Boulder Police Department and often assists other police agencies, in cold case research, all over the country. She can be contacted through her website, www.silviapettem.com.