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 Expert  726312

Expert in Injury Biomechanics (head and spine), Medical Device Design, Structural Analysis, Patents

Available for your Consulting and Expert Witness Needs

Maryland (MD)
Education Work History Career AccomplishmentsPublicationsConsulting Services Expert Witness Market Research

Summary of Expertise:

Listed with other top experts in: 

Expert has over 30 years of experience in structural analysis, including experience porting finite element codes to specialized architectures, developing special-purpose mesh generation tools, and assessing the correspondence of structural models with experimental measurements. Expert has developed de novo programs to simulate bone remodeling around orthopedic devices, and has broad experience in strucural nonlinearities such as contact, plasticity, NiTinol alloys, and fracture mechanics. Expert has used structural analyses in expert witness testimony and has reviewed the testimony of opposing experts. Based on a doctorate in mechanical engineering from MIT, years of university teaching experience in mechanics and biomechanics, and on over 30 refereed journal articles, Expert has the appropriate background for a range of engagements in mechanics and structural analysis.

Expert passed the patent bar in 2002, and has testified in a number of patent disputes.


applied mechanics




continuum mechanics


fracture mechanics


legal patenting




structural mechanics

Expert has been working in biomechanics since his BS degree in mechanical engineering from MIT in 1980, and worked building instrumentation while an undergraduate as well. His initial position, between undergraduate and graduate school, was at the orthopedic biomechanics lab at the Mayo Clinic from 1980 to 1981, when he returned to graduate school. Expert has published on bone mechanics, cartilage mechanics, injury mechanics, and circulatory control over the space of the last 30 years. Currently, he is engaged in research on traumatic brain injury due to blast loading at the Johns Hopkins University Applied Physics Laboratory, where he is able to consult for non-government-related issues. Expert has given deposition testimony in over 20 cases regarding injury mechanics and the mechanical factors that are associated with injuries.

Dr. Harrign has taught biomechanics and mechanical design at Rice University and at three medical schools (to residents in preparation for professional exams).








biomedical engineering


biomedical instrumentation


bone mechanics

Expert has a broad background in medical device analysis and consulting, including projects involving stents, endoscopic surgical tools, bone plates, pacemaker leads, catheters, total joint replacements, inhalers, vena cava filters, wound therapy devices, exercise equipment, in vitro fertilization equipment, and insulin pumps. Expert has published papers on failure processes in total joint replacements, testing methods for interfaces, and elastography. Since passing the patent bar in 2002, Expert has consulted on several patent actions involving medical devices as well as actions involving paintball guns, children's furniture, and other devices.


biomedical device


medical device




implantable device


medical instrument


surgical instrument



Expert is currently developing finite element computer models of the head, neck and thorax for the analysis of injury in military applications. In the past several years, Expert has developed computer models for mechanisms of mild traumatic brain injury, blast-related head trauma, and blast-resistant crew seating in military vehicles. In the past several years, Expert has also given expert witness testimony on injuries in automobile accidents and industrial accidents, including cases involving construction and offshore oil platforms.

brain injury


head and neck injury


injury biomechanics


orthopedic injury


spine injury


workplace injury

Show Secondary and Basic Areas of Expertise
Expert may consult nationally and internationally, and is also local to the following cities: Baltimore, Maryland;  Frederick, Maryland;  Gaithersburg, Maryland;  Bowie, Maryland;  Wilmington, Delaware;  Lancaster, Pennsylvania;  and Alexandria, Virginia.

Year   Degree   Subject   Institution   Honors
1999   MBA   Marketing and Entrepreneurship   University of Houston  
1985   ScD   Mechanical Engineering   MIT  
1980   BS   Mechanical Engineering   MIT   Pi Tau Sigma, Eta Kappa Nu

Work History:
Years   Employer   Department   Title   Responsibilities

2009 to 2010


Johns Hopkins University Applied Physics Laboratory


National Security Technology Division


Senior Professional Staff


He is leading computational analysis efforts in the biomechanics of injuries to the head, neck, spine, and thorax due to blast loading

2005 to 2009


Foster-Miller Inc


Structures and Transportation


Senior Engineer


Engineering Program Development in Biomechanics; Blast Mitigation, Injury prevention, Structural Analysis, and Computational Fluid Dynamics.

2000 to 2005


Exponent Failure Analysis Associates




Senior Engineer


Expert witness on injury analysis, medical devices, and patent infringement. Contract R&D on medical devices.

1999 to 1999




Business Development




Tasked with developing strategies to provide CPAP in stroke and heart failure.

1993 to 1999


UT Medical School at Houston




Assistant Professor


Develop research programs, supervise resident research, collaborate with medical faculty

1993 to 1999


Rice University


Mechanical Engineering


Visiting Associate Professor


Develop and teach Biomechanics courses, teach engineering design, and teach applied mechanics

1993 to 1999


University of Houston


Mechanical Engineering


Adjunct Professor


Supervise graduate students.

Career Accomplishments:

Orthopedic Research Society; American Society of Mechanical Engineers.


PE Texas; Registered Patent Agent, USPTO.

Publications and Patents Summary

Thirty-three (33) refereed research papers.

Selected Publications and Publishers  
 - Journal of Materials Science  
 - Comments on Theoretical Biology  
 - Annals of Biomedical Engineering  
 - Ultrasound in Medicine and Biology  
 - ASME International Mechanical Engineering Congress and Exposition  

Government Experience:
Years   Agency   Role   Description
2008 to 2009   USAMRMC   Reviewer   Reviewed Proposals for funding in Traumatic Brain Injury

Consulting Services:
Selected Consulting Examples:
  • Oil Rig Injury Cases: Testified in court and deposition on claims involving back and neck injuries during duties on oil rigs: Pulling slips, Nippling Down.
  • Developed measurements and mathematical models for fluid pumping due to loose tolerances in orthopedic implants under load.
  • Measured strains in a deep water repair device for 20 inch pipelines to assess the accuracy needed for proper sealing at depth.
  • Developed an ultrasonic indentation gauge for measuring cartilage material stiffness in situ.
  • Developed a measurement technique and measured strains within tissue expanders for reconstruction after mastectomy: Showed that the local curvature of the tissue expander was responsible for strain differences within the envelope of the expander.
Recent Client Requests:
  • Expert for consulting on design of centrifugal pump for medical ventilator.
Click the green button above to contact Expert for a free initial screening call regarding your expert consulting needs.  Expert is available for consulting to corporate, legal and government clients.  Remember, your initial screening call to speak with Expert is free.

Expert Witness:
Expert Witness Experience Summary:
Approximately 20 depositions on injury, patent cases, and medical devices. Six in-court appearances in injury, product liability, and patent cases. Passed the Patent bar (as an agent), 2002.
Click the green button above to contact Expert for a free initial screening call regarding expert testimony, litigation consulting and support, forensic services, or any related expert witness services.  A few litigation needs include product liability, personal injury, economic loss, intellectual property (patent, trademark, trade secret, copyright), and insurance matters.  Remember, your initial screening call to speak with Expert is free.

Language Skills:
Foreign Language   Description
Russian   Mid-intermediate level - can read scientific papers and web sites.

Market Research:
Long-term exposure (over 25 years) to orthopedic devices and technology.

Click the green button above to contact Expert for a free initial screening call regarding your marketing research, industry research, and company research needs.  For research needs involving multiple experts or secondary research, a Research Director can be assigned to coordinate the work into a custom report for you as a potentially quicker and more cost effective alternative to doing this work yourself or hiring a boutique consultancy.  Remember, your initial screening call to speak with Expert is free.

Additional Skills and Services:

Biomechanics courses for orthopedic residents; Biomechanics courses for undergraduate and graduate students at Rice University


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