Dimitris Papastergiou was born in 1973 in Trikala. He graduated from the Polycladic Lyceum of Trikala and the School of Electrical and Computer Engineering of NTUA (National Technical University of Athens). At the same time, he attended journalism courses, while he maintains strong ties with technology and the internet, a relationship that was strengthened at the Multimedia Laboratory of NTUA.

In 2001 he built and presented, together with a group of his colleagues, the first integrated website for the Prefecture of Trikala, 3kala.gr. Since 2002 he has been practicing the profession of Electrical and Computer Engineer in the city of Trikala. He was involved in studies and construction of private electromechanical projects and the creation of software programs. In 2007 he entered the field of renewable energy and has constructed more than 300 private renewable energy projects. His involvement in the community began in 2002, with his election to the City Council. He was re-elected in 2006, and in 2014 he was elected Mayor of Trikkaion and member of the Board of Directors of KEDE.

He was re-elected Mayor in 2019 and, in the same year, he was elected President of the KEDE. He is married to the engineer Soula Brakis and is the happy father of Faye, Kostas and Nikos. From June 2023, he is Minister of Digital Governance in the government of Kyriakos Mitsotakis.