Kostas Deligiannis graduated from the Physics Department of Athens University (Greece) in 1994. He was awarded with a PhD in Solid State Physics from the University of Southampton (UK), where he also worked as a Researcher for one year.
From 1998 to 2001 he worked in CNRS (Centre National de la Recherche Scientifique) in Grenoble (France) in the domain of superconductivity, having been awarded the European Union Marie Curie Fellowship. He has also been also honored with the Bodossaki Foundation Scholarship.
He joined GE Healthcare in 2003, and in 2005 he was promoted to Sales Manager for Greece.
In 2010 he became Zone Manager for Central and West Balkans, and in 2013 he took over the position of General Manager for South Eastern Europe. In 2018, Kostas became the General Manager for GE Healthcare in Eastern Europe. In 2024 he was appointed Zone President for Middle East, Northeast & Sub-Saharan Africa, Turkey, Russia, and CIS countries.