Yefim Kotlyar has over 40 years of experience in the art of gearing. His expertise includes developments of various gear cutting & grinding technologies, development of gear inspection and evaluation technologies, development and implementation of SPC for gear manufacturing processes and design and validation of gears and gearing systems. He is also the author and one of the owners of GearOffice computer program. Yefim Kotlyar has served on a number of AGMA technical committees and he has authored many articles on gearing subjects.