Mechanical Engineer M28649Metallurgical Engineer MT1845Pguthorn@vglabs.com

  • Mechanical/Metallurgical Failure Analysis
  • Vehicle Systems Analysis
  • Accident Reconstruction
  • Fork Lift, Boom Lift, Scissor Lift Accident Analysis
  • Fire Analysis
Master of Science in Mechanical Engineering
California State University, Long Beach (1983)
Bachelor of Science in Materials Science Engineering
Brown University (1979)
Post Graduate Courses and Research
UCLA (1987-1993)
Performance of Vehicles
UCLA (1991)
Fire Analysis and Behavior
UCLA Extension (1991)

Skyjack Scissor Lift Service Training (2009)

JLG Ultra Boom Service Training (2009)

JLG Boom Lift Service Training (2008)

The Role of Warnings & Instructions, University of Wisconsin (2006)

Engineering Dynamics Corporation HVE Forum (2003)

Crash Data Retrieval System Training Course (2001)

Society of Automotive Engineers International Congress: Accident Reconstruction (1998)

Photogrammetry in Accident Reconstruction (1997)

Investigation of Motor Vehicle Fires (1996)

Motorcycle Accident Reconstruction (1996)

Introduction to PC-Crash and PC-Rect (1995)

Heavy Vehicle Rollovers: A Safety Issue Toptec

Society of Automotive Engineers (1993)

Advanced Traffic Accident Reconstruction with the Use of Microcomputers

University of North Florida (1992)


Professional Engineer, California Number MT1845

Professional Engineer, California Number MT28649

Professional Engineer, Alabama Number 27133-E


Mobile Equipment Trainer

Forklift Operator

Boom Lift Operator

Rough Terrain Lift Truck Operator

Aerial Work Platform Operator


Vice-President, Vollmer-Gray Engineering Laboratories, Inc. (January 2000 to Present); Staff Engineer, Vollmer-Gray Engineering Laboratories (May 1989 to December 1999). Mobile hydraulic equipment, aerial work platform and fork lift accident analysis. Metallurgical and mechanical failure analysis, vehicular systems analysis, accident reconstruction, fire analysis.

Engineer, Fowler, Inc. (November 1986 to May 1989). Failure and fracture analyses of metallic structures, metallographic and fractrographic studies, static and fatigue testing on full-scale structrual components.

Section Manager, Douglas Aircraft Company (April 1985 to October 1986). Managed failure analysis activities for Materials and Process Engineering Department. Immediate supervisor of nine engineers and three laboratory technicians. Provided overall cognizance of all in-service and test failure analysis.

Senior Engineer, Douglas Aircraft Company (September 1979 to March 1985). Failure analyses of DC-8, DC-9 and DC-10 aircraft. Research and development of high strength aluminum alloys and SPF/DB Ti-A1-4V. Design allowable testing for new aluminum alloys. Fracture toughness and crack growth rate testing of aerospace materials. Processing of aluminum alloys, stainless steel alloys, castings, forgings, shot peening, peen forming. Member of AMEC sub-committee on shot peening. On-site surveys of primary and secondary metal producers.


Safe Operation of Aerial Lifts – An Important Component of a Safe Jobsite, Aerial Platform Safety Conference, November 2006

Aerial Equipment Accident Investigation, Specialty Risk Services, July 2005

Documentation, Preservation and Interpretation of Physical Evidence in an Accident Investigation, Aerial Platform Safety Conference, Dallas, TX, November 4, 2004

Automotive Systems and Accident Reconstruction, Automobile Club of Southern California, November 16, 2003

Automotive Systems and Accident Reconstruction, 21st Century Insurance, November 20, 2002

Crash Data Retrieval in Accident Reconstruction, Farmers Insurance, February 20, 2002

Investigation of Vehicle Defects, Law Offices of Gilbert, Kelly, Crowley and Jennett, Los Angeles, CA, April 21, 2001


ANSI/SAIA A92 Aerial Platforms

ANSI/SAIA Subcommittees:

A92.3 Manually Propelled Elevating Aerial Platforms

A92.5 Boom-Supported Elevating Aerial Platforms

A92.6 Self-Propelled Elevating Work Platforms

A92.20 Aerial Work Platform Design

A92.22 Aerial Work Platform Safe Use

A92.24 Aerial Work Platform Training

ITSDF B56.6 Rough Terrain Forklift Trucks


ASM International

Society of Automotive Engineers

American Society of Mechanical Engineers

Southwest Association of Technical Accident Investigators

Scaffold Industry Association