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Crime Scene Shooting Tool Marks Ballistics Trace Evidence Expert Witness

Provides Opinion & Testimony In:

Forensic Scientist, Crime Scene Shooting Investigation Reconstruction, Tool Marks, Ballistics, Trace Evidence, Semen, Drug Analysis, Blood Spatter, Latent Prints, Product Tampering, Court Exhibits, Firearm Tool Mark Examinations, Trace Evidence Analysis, Bloodstain Pattern Analysis, Controlled Substance Identification, Crime Scene Reconstruction, Shooting Incident Reconstruction, Gunpowder Primer Residue, Footwear Tire Tread Impression Evidence, firearms

Expert Witness No. 146


Expert retired in 1996 after a 23-year career as a forensic scientist and a crime laboratory director.  During his years with government crime laboratories, he received extensive training in specialized areas of forensic science from the FBI, DEA, ATF, as well as through a number of professional forensic organizations such as the Association of Firearm and Tool Mark Examiners, the International Association for Identification and the American Academy of Forensic Sciences.

During that time, he conducted forensic research in many different areas and published numerous papers in professional forensic journals.  He was also active in a number of forensic societies, serving on various committees and holding a number of offices.  He has been qualified as an expert in the field of forensic science at the state and federal level in both criminal and civil courts and in a number of states.

Expert provides consultations, analysis, expert testimony and forensic training.  He is presently on the faculty of the University of North Texas and serves as the forensic training coordinator for the University of North Texas Police Academy in Denton, Texas.

Present Positions

Director, F.S.A., since 1997


Former Positions

  • Instructor of Chemistry, Blinn College, Brenham, Texas 1970-1974
  • Assistant Laboratory Director, Fort Worth Police Department, 1974-1983
  • Adjunct Instructor of Chemistry, Weatherford College, Weatherford, Texas 1976-1980
  • Adjunct Instructor of Criminal Justice, University of Texas at Arlington, 1980-1983
  • Supervising Criminalist, Arizona Department of Public Safety, 1983-1996 (ret.)
  • Adjunct Instructor of Police Science, Northern Arizona University, 1984-1994
  • Firearms Examiner, Tulsa Police Department, Tulsa, Oklahoma 1996-1997
  • Adjunct Instructor of Police Science, Tulsa Community College, 1997
  • Laboratory Manager, Weckerling Scientific Laboratories, Carrollton, Texas 1997-1998
  • Criminalist, Forensic Consultant Services, Fort Worth, Texas, 1998-1999
  • Principal Lecturer/Criminalistics Coordinator, University of North Texas, 1999-2012 (ret.)

Formal Education

  • B.S., Chemistry, Sam Houston State University, 1968
  • M.A., Chemistry, Sam Houston State University, 1971

Special Courses Attended

  • DEA Forensic Chemist Seminar, McLean, Virginia, 1975
  • FBI Glass Analysis Course, Quantico, Virginia, 1976
  • Applied Molecular Spectroscopy, Arizona State University, Tempe, Arizona, 1977
  • ATF Arson Residue Analysis Course, Rockville, Maryland, 1980
  • FBI Gunshot Residue Analysis Course, Quantico, Virginia, 1981
  • Ballistics and Handloading Course, Trinidad State College, Trinidad, Colorado, 1982
  • Polarized Light Microscopy, McCrone Institute, Austin, Texas, 1982
  • FBI Instrumental Analysis of Paints and Polymers Course, Quantico, Virginia, 1983
  • FBI Symposium on Footwear and Tire Tread Examination, Quantico, Virginia, 1984
  • X-Ray Fluorescence Class, Tracor Corporation, Flagstaff, Arizona, 1985
  • FBI Specialized Techniques in Firearms Identification Course, Quantico, Virginia, 1987
  • Ruger Police Armorer’s Course, Phoenix Police Academy, Phoenix, Arizona, 1987
  • Crime Scene Reconstruction Class, Dr. Henry Lee, Scottsdale, Arizona, 1988
  • AFTE Glock Armorer’s Class, Virginia Beach, Virginia, 1989
  • AFTE Remington 1100 Service Class, Houston, Texas, 1991
  • Photomicrography Class, Leitz Corporation, Phoenix, Arizona, 1991
  • Crime Scene Photography, Flagstaff, Arizona 1992
  • Wound Ballistics Class, Dr. Martin Fackler, Glendale, Arizona, 1992
  • Blood Spatter Interpretation and Crime Scene Reconstruction, Scottsdale, Arizona, 1993
  • FBI Footwear and Tire Tread Examination Seminar (presenter), Quantico, Virginia, 1994
  • SWAFS Shooting Reconstruction Class, Colorado Springs, Colorado, 1995
  • SWAFS Lamp Bulb Examination Class, Colorado Springs, Colorado, 1995
  • Accident Reconstruction and Low-Speed Crash Evaluation, Texas A&M University, 1996
  • Bloodstain Pattern Interpretation, University of North Texas, 2000
  • Recovery of Buried Remains, University of North Texas, 2001
  • Bloodstain Pattern Analysis in Crimes of Violence – Pt. II, University of North Texas, 2002
  • Blood Wipes, Swipes & Other Patterns, IAI Training Seminar, Boston, MA, 2006
  • Preparation of Demonstrative Exhibits for Bloodstain Pattern Analysis, IAI Training Seminar, Boston, MA, 2006
  • Microscopical Approach to Trace Evidence in Shootings, AAFS, Denver, CO, 2009

Professional Affiliations

  • Fellow of the American Academy of Forensic Sciences
  • Distinguished Member of the Association of Firearm and Tool Mark Examiners
  • Emeritus Member of the Southwestern Association of Forensic Scientists
  • Emeritus Member of the American Society of Crime Laboratory Directors
  • Member of the International Association of Bloodstain Pattern Analysts

Papers Presented

Available upon Request

Specialized Forensic Classes Taught

Available upon Request

Professional Offices Held

Association of Firearm and Tool Mark Examiners:

  • Reviewer for AFTE Journal, 1989-2009

Southwestern Association of Forensic Scientists:

  • Program Chairman, 1984
  • Member, Board of Directors, 1986-1988
  • Chair of Professional Development, 1988-1990
  • SWAFS Journal Editor, 1988-1992
  • President, 1993-1994
  • Chairman, Board of Directors, 1994-1995
  • Fall Meeting Workshop Chair, 1993

American Society of Crime Lab Directors:

  • Member, Board of Directors, 1986-1989
  • Chair, Publication Committee, 1986-1987
  • Chair, Membership Committee, 1987-1989
  • Laboratory Accreditation Inspector, 1987-1995
  • Laboratory Accreditation Board Member, 1996
  • Forensic Science Operations and Program Committee, 1988-1991
  • Member, Management Committee, 1992-1994
  • Chair, Crime Scene Investigation Standards Committee, 1996


  • Distinguished Member Award,” Association of Firearm and Tool Mark Examiners (AFTE),1988
  • “James Zotter Award,” SW Assn. of Forensic Scientists, 1991, (“For Outstanding Dedication and Contributions to the SW Association of Forensic Scientists and  Forensic Science”)
  • “Best Technical Paper,” Southern and SW Assns. of  Forensic Scientists, 1992, “The Use of Videomicroscopy in Footwear Comparisons”
  • “Best Technical Paper,” SW Assn. of Forensic Scientists, 1993, “The Reconstruction of a Double Homicide near Ashfork, Arizona”
  • “Best Technical Paper,” Southern and SW Associations of Forensic Scientists Joint Conference, 1994, “The Use of Hand-Held Laser Pointers in the Reconstruction of Events at Crime Scenes,” co-authored with Max Courtney
  • Awarded Emeritus status in the American Society of Crime Laboratory Directors, 1996
  • Awarded Emeritus status in the Southwestern Association of Forensic Scientists, 1996
  • Co-recipient of the annual MLK Award for Community service in 2007 for work done on the Houston Crime Lab project (Review of Firearms Cases)
  • Co-recipient of award for “Top 10 Books for Youth” in 2009 for “Fingerprints & Firearms”
  • “Distinguished Faculty Award”, University of North Texas, 2012




Expert Articles

Lateral Angle Determination for Bullet Holes in Windshields

Abstract:Bullets passing through windshield glass (safety glass) typically produce oval-shaped holes due to the slant of the windshield. The direction of the shot is determined by examining the margins of the hole. The margins of both sides (entry and exit)… Continue Reading

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