John Leffler, PE, is a Senior Managing Engineer with YA Group in Philadelphia, specializing in walkway friction analysis and safety standards. With a Bachelor of Mechanical Engineering from Georgia Tech, John has authored numerous peer-reviewed works and investigated over 1,100 forensic cases, focusing on product defects and pedestrian falls. As a former IndyCar mechanic and product design firm owner, John has over 15 years of experience in standards development with ASTM International. Currently, they co-own Slip-Test LLC, where they lead efforts in pedestrian walkway safety consulting and tribometer manufacturing.
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