Nathan Shigemura

Nathan Shigemura has been an adjunct faculty member of the Institute of Police Technology and Management (IPTM) since 1989 for whom he teaches courses in all levels of traffic crash investigation and reconstruction worldwide.

He retired in 2002 as a sergeant from the Illinois State Police, where his duties included crash investigation instructor, traffic crash reconstructionist and supervisor of the statewide Traffic Crash Reconstruction Unit.

As co-owner of the Traffic Safety Group, LLC, a traffic crash reconstruction and analysis company based in Illinois, Mr. Shigemura remains active as a reconstructionist. He continues to give presentations at numerous conferences and seminars as well as testify as an expert in depositions and state and federal courts.

He earned a Bachelor of Science degree in Electrical and Electronic Engineering (BSEE) from the University of Illinois, Chicago. He is an active member and a past president of the Illinois Association of Technical Accident Investigators (IATAI) and is an active member of the Society of Automotive Engineers (SAE) and the Fraternal Order of Police.

Mr. Shigemura is the author of Mathematics for the Traffic Accident Investigator and Reconstructionist, published by IPTM in 1996, coauthor (with John Daily) of Fundamentals of Applied Physics for Traffic Accident Investigators (Volume 1 of the Traffic Accident Reconstruction Series), published by IPTM in 1997, coauthor (with John Daily and Jeremy Daily) of Fundamentals of Traffic Crash Reconstruction (Volume 2 of the Traffic Accident Reconstruction Series), published by IPTM in 2006 and coauthor (with Andrew Rich) of Balancing Collision Forces in Crush/Energy Analyses published by IPTM in 2007.

Mr. Shigemura is certified as an accident reconstructionist by the State of Illinois and is accredited as a traffic accident reconstructionist by the Accreditation Commission for Traffic Accident Reconstruction (ACTAR).

Course Expertise

  • Crash Investigation