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Greg Lange, P.E. is a Senior Performance Engineer at Energy Systems Group since January 2017, previously serving as a Mechanical Engineer at DEEM, LLC from April 2011 to January 2017, where responsibilities included designing plumbing, HVAC, pipefitting, HVAC controls, and electrical systems across various sectors including K-12 education and manufacturing. Prior to that, Greg worked as a Senior Engineer at Messer Construction Co. from January 2003 to April 2011, focusing on in-house commissioning for facilities valued at over $500 million. Greg holds a Bachelor of Science degree in Mechanical Engineering from Purdue University, earned between 1998 and 2002.