He began his teaching career at the
Gheorghe Lazăr National College in
Bucharest. He then moved to
Craiova where he taught at the
Tudor Vladimirescu National College, and
Carol I National College. In 1990, he joined the University of Craiova as professor of
theoretical physics. He served as Dean of the Faculty of Physics of the Craiova University from 1999 to 2004. Between 2005 and 2009 and 2016 to 2020 he served as vice rector of the University of Craiova on Scientific Research. He also served as the institutional coordinator of the Socrates program at the University of Craiova.
Career highlights and recognition In 2009, Constantinescu was elected Secretary General of the Romanian Physical Society. He was also named Vice Chair of the American Romanian Academy of Arts and Sciences congress in 2017. In 2011, he served as representative of Romanian rectors at the
Bologna Process. Between 2009 and 2015 he was appointed president of the Southeastern European Network in Mathematical and Theoretical Physics. Between 2013 and 2022 he served as the Chairman of the Committee for European Integration of the
European Physical Society. In September 2022 he was elected as the 12th president of the Balkan Physical Union. == Publications ==