I have 41 years of experience and specialize in the field of forensic criminalistic firearm toolmark with specific knowledge in the areas of ballistics, shoeprints, knife wounds, crime scene, self defense and unattended death, suicide. I have published on such topics as firearm, toolmarks, shoeprints, crime scene and bomb scene. I have testified 50 times on topics such as firearms, toolmarks, shoeprints and knife wounds.