Grigoris Alexopoulos was born in Patras in 1967. He is married and has a daughter. He graduated from the 2nd High School of Patras in 1984, was admitted with a scholarship to the Department of Civil Engineering of the Polytechnic School of the University of Patras.  In 1990 graduated and began his work as a freelance Civil Engineer.

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.

From October 2019, he was elected President of the Solid Waste Management Association of the Prefecture of Achaia, while since 2019 he has been elected President of the Supervisory Board of Regional Union of Municipalities of Western Greece and Member of the Energy, Environment and Waste Management Committee of the Central Union of Greek Municipalities.

He has been: Member of the Board of Directors of the Organization “Patras – European Capital of Culture 2006”, Vice President of “Development Achaia SA”, member of the Board of Directors of the Tourism Development Company of Western Greece and member of the Finance Committee of the Central Union of Municipalities and Communities of Greece.