Mark E. Vecellio is currently an instructor at Fayetteville Technical Community College, in North Carolina. He previously served in the U.S. Army Criminal Investigations Command from 1995 to 2011. He is a current member of numerous forensic science organizations and has led investigative task forces in robbery, rape, and arson crimes. Erick P. Bryant currently serves as Crime Scene Analyst with the Colorado Bureau of Investigation and previously served with the U.

S. Army Criminal Investigation Command (CID) where he retired as the Chief, Policy Branch at the U.S. Army CID Headquarters in Quantico, VA. He has expertise in crime scene investigation, analysis and reconstruction, forensic photography, bloodstain pattern analysis, and criminal, sexual assault, and death investigation, among others areas. He currently holds membership in the American Academy of Forensic Science (AAFS) and the International Association for Identification (IAI). on for Identification (IAI).