Yefim Kotlyar is the Application Engineering Manager at Machine Tool Builders (MTB), responsible for the development of new gear manufacturing and gear metrology technologies. His broad experience in the art of gearing includes the development of various gear cutting technologies, analytical inspection and evaluation technologies for gears and hobs, as well as the gear systems design and validation. Kotlyar has served on a number of AGMA technical committees, and he has authored numerous articles on gearing.