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Mark L. Koehler

Outside Sales, Key Accounts - Lighting Group / Principal


Mark joined DT&B’s sales team in 1982 and now serves a key sales and mentoring role.  In 1981 he joined the Commercial Marketing Department of the real estate development firm David Kornblatt Company.  Mark is a graduate of the University of Maryland with a BS Degree in Marketing and started his business career with a leading retail supplier of high-end electronic equipment.


In his current role, Mark has sales responsibility for commercial contractors, electrical distributors and key accounts, and mentors the One Source Inside and Outside sales teams when navigating major projects and complex situations.  Mark’s ability to understand the point of view of every stakeholder in a situation, from owner to designer to distributor, helps One Source develop and implement strategies that ensure success.


Mark is an industry expert and has attained the prestigious and hard-earned “Super Rep” status from Lutron.