Kleomenis Tsiganis was born in Larissa (1974), where he graduated from the 4th Lyceum. He received his degree in Physics (1996) and his PhD (2002) from the Aristotle University of Thessaloniki (AUTh), supported by a scholarship from the State Scholarships Foundation (IKY). He worked as a postdoctoral researcher (EU Marie Curie fellowship) at the Observatoire de Nice (CNRS, France) and as a visiting researcher at the Southwest Research Institute (USA). In 2006, he was appointed Lecturer at AUTh, where he currently serves as Associate Professor and Director of the Section of Astrophysics, Astronomy, and Mechanics (2019–present). He is a member of the Hellenic Astronomical Society (having served two terms on its Board of Directors) and the International Astronomical Union (IAU).

He has authored over 100 scientific publications (with more than 5,000 citations) and has participated in over 30 international conferences. He is a regular reviewer for major scientific journals and serves as an Associate Editor for the journals *Annales Geophysicae* and *Celestial Mechanics & Dynamical Astronomy*. He is a member of the AIDA space mission research team (2015–present) and has taught in the ESA Basic Astronaut Training Program (2016). He served on the European Science Foundation expert panel tasked with defining the European research roadmap for astrobiology (2016). He has received numerous distinctions for his work, including the naming of an asteroid as “(21775) Tsiganis” by the IAU (2008), the “Georgios Foteinos” Astronomy Award from the Academy of Athens (2013), and the “Paolo Farinella International Prize” from the European Planetary Science Congress (2016).

His primary research interests lie in celestial mechanics, dynamical astronomy, and planetary science. His work focuses on the formation and evolution of the solar system, the chaotic dynamics of asteroids, and the dynamics of satellites and space debris.