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Constantinos Kalogiannis has a strong background in sales and engineering. From August 2010 to May 2019, they worked at HERON, first as a B2B Sales Manager and then as a Sales Director. In their role as B2B Sales Manager, they oversaw the B2B Sales Department and managed important accounts, including high voltage customers, medium voltage customers, and retail chain stores. Constantinos analyzed energy data, negotiated contracts, and identified new sales opportunities. Prior to that, from November 2005 to May 2010, they worked at Altec S.A as an Electrical and Computer Engineer, where they gained expertise in the field.

Constantinos Kalogiannis completed their Bachelor's degree in Electrical and Computer Engineering from the National Technical University of Athens in 2005. Constantinos then pursued a Master of Science (MSc) in Energy Production & Management from the same university, which they successfully obtained in 2009. The focus of their studies during both degrees was on various aspects of energy, including its production, transport, distribution, and utilization of electric energy.