Christos Diamantis has been a member of the Athens Bar Association since 2002. He completed his legal studies at the National and Kapodistrian University of Athens Law School and pursued postgraduate studies specializing in Criminal Law and Criminal Procedure at the same university (2000–2002).

He is a member of the Association of Greek Penalists and has participated in various criminal law conferences both as an attendee and a speaker (e.g., “Intent and Negligence in Criminal Law”). He has also published articles in legal journals.

Christos specializes in Criminal Law, with a particular focus on Economic Criminal Law and handling high-profile “white-collar crime” cases. He has been involved in several prominent cases that attracted public attention, such as the “Panteion University Funds Misappropriation Case,” the “Fixed Football Matches Scandal,” and the “Grigoropoulos Homicide Case,” among others.