Automatic Door Expert Witness

Warren F. Davis, Ph.D., has served as an expert witness in more than 405 legal cases involving automatic pedestrian doors since 1993.   He holds two U.S. patents (5,481,266 and 6,281,803) related to such doors, and has served in cases involving all types of doors sliding, folding, swinging and revolving and virtually every major manufacturer operating within the United States.

Dr. Davis was the first to identify and explain:
  • The "triple design flaw" exhibited by certain automatic sliding door sensor systems,

  • The effects of poor IR (infrared) reflectivity on the detection reliability of door-mounted active IR presence sensors used on swinging doors, and

  • Significant errors relating to door kinetic energy appearing in the ANSI A156.27-2003 national revolving door standard.
  He was also the first to call for:
  • Closed-loop (self diagnostic) sensor design, and

  • Microprocessor-enforced performance of Daily Safety Checks to enhance door safety.
Dr. Davis' services as an expert witness or consulting expert in the area of automatic pedestrian doors are available.   Additional information is provided by, and can be downloaded from, the following links.




    Fee Schedule and Retainer Agreement
 
Download a copy of Dr. Davis' Fee Schedule/Retainer Agreement (two pages) in Adobe PDF format for viewing and printing using Adobe Acrobat Reader.   The executed Retainer Agreement can be mailed or FAXed to Davis Associates, Inc.   (Address and FAX number are located at the bottom of this page).
 
    Curriculum Vitae
 
Download a copy of Dr. Davis' Curriculum Vitae (four pages) in Adobe PDF format for viewing and printing using Adobe Acrobat Reader.
 
    Compilation of automatic pedestrian door cases
 
Download a compilation (513 Kb, 130 pages, revision of October 23, 2017) of the automatic pedestrian door cases Dr. Davis has handled to date, in Adobe PDF format for viewing and printing using Adobe Acrobat Reader.
 
    Free Initial Consult
 
If you have, or are considering, an automatic pedestrian door case and have a question or would just like to discuss your case, please call us at 617-244-1450 or fill in and submit your question using the following form.   Please note that most fields are optional, unless you request a response by mail or FAX.
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    Description of the "triple design flaw"
 
Download a description by Dr. Davis of the triple design flaw (7 pages, 46 Kb) in Adobe PDF format for viewing and printing using Adobe Acrobat Reader.




If you do not have a copy of Acrobat Reader, it is available free from Adobe Adobe



Davis Associates, Inc. 43 Holden Road Newton, MA 02465-1909 U.S.A. 617-244-1450 FAX: 617-964-4917
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