Ο Γρηγόρης Αλεξόπουλος γεννήθηκε το 1967. Έχει σπουδάσει Πολιτικός Μηχανικός, όπου εισήχθη με υποτροφία στην Πολυτεχνική Σχολή του Πανεπιστημίου Πατρών και έχει μεταπτυχιακές σπουδές στην Διοίκηση Επιχειρήσεων (MBA).

He was elected President of the Association of Civil Engineers of Achaia in 1996 and a member of the Delegation of the Technical Chamber of Greece / Department of Western Greece.

He was elected Mayor of Olenia in 1998 and Secretary of the Local Union of Municipalities and Communities of the Prefecture of Achaia. He was re-elected Mayor of Olenia in 2002 and Vice President of the Local Union of Municipalities and Communities of the Prefecture of Achaia. In 2004 he was elected President of the Local Union of Municipalities & Communities of the Prefecture of Achaia. In 2006 he was re-elected Mayor of Olenia and President of Local Union of Municipalities & Communities of the Prefecture of Achaia. In 2008 he was elected President of the Waste Management Association of the 2nd Unit of the Prefecture of Achaia.

In the Regional Elections of November 2010, he was elected Deputy Regional Governor of Achaia and was appointed Deputy Regional Governor of Western Greece. In 2014 he continued in the position of Deputy Regional Governor of Achaia. In the local elections of 2019, he was a candidate for Mayor of Patras, where he was elected Leader of the Major Opposition in the Municipal Council of Patras.

Μέλος της Επιτροπής Οικονομικών της Κεντρικής Ένωσης Δήμων και Κοινοτήτων Ελλάδας (2006-2010). Πρόεδρος του Συνδέσμου Διαχείρισης Απορριμμάτων 2ης Ενότητας του Νομού Αχαΐας (2008-2010).

Πρόεδρος Εποπτικού Συμβουλίου Περιφερειακής Ένωσης Δήμων Δυτικής Ελλάδας (2019). Μέλος Επιτροπής Ενέργειας, Περιβάλλοντος & Διαχείρισης Απορριμμάτων ΚΕΔΕ (2020) Μέλος Διοικητικού Συμβουλίου Κεντρικής Ένωσης Δήμων Ελλάδας (2021)