I have 22 years of experience, and specialize in the field of firearm and toolmark Identification with specific knowledge in the areas of microscopic comparisons, crime scene analysis and firearm functionality. I have published on such topics as circumferential fractures. I have testified 99 times on topics such as microscopic comparisions and crime scenes as they relate to firearms and firearm functionality. I am a pioneer in 3D analysis of fired bullets, and I have received two national awards for my work.