Alexander Trinidad is PhD in Psychology (University of the Basque Country UPV/EHU). He specialised in Legal and Forensic Psychology with a Masters' degree at the University of Santiago de Compostela. Nowadays, he holds a postdoctoral position at the UPV/EHU and at the NSCR (Amsterdam), funded by the Basque Government. 

He researchs the antisocial and delinquent behaviour and its concentration at place. Moreover, Alexander researchs the individual characteristics of the guardians; that is the individual characteristics that make someone to act directly or indirectly to deter offenders. 

Alexander has participated in several national and international conferences, and has published some papers in peer-reviewed international journals. Moreover, since September 2017 he is assistant editor of the "International E-Journal of Criminal Sciences".