GLHN is pleased to announce some exciting changes in our Mechanical Engineering Department.  Effective May 4th, Douglas Stingelin, PE, QCxP, LEED AP, has taken over the position of Director of Mechanical Engineering from Henry Johnstone.  Doug has been with the firm for 14 years and has led the development of an exceptional Commissioning team.  Henry will continue in his role as President of GLHN.  William Koller, PE has been promoted to Mechanical Engineering Department Manager.  Bill joined the firm in 2007 as an intern and has developed expertise with central utility plants and campus infrastructure. Jon Ziegler, PE, LEED AP, BESA, has been promoted to Senior Mechanical Engineer/Analyst.  Jon has been with GLHN for 12 years and specializes in energy modeling and analytics.  We look forward to a new generation of leadership and the successes they will bring to the firm.

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