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 Region.

He was elected Mayor of Olenia Municipality for the first time in 1998 and as mayor he was elected as Secretary of the Union of Municipalities and Communities of the Achaia Prefecture.

After winning the Municipal Elections in 2002, he was re-elected Mayor of Olenia Municipality, while in the Board of the Union of Municipalities and Communities of the Achaia Prefecture he was elected first as Vice-President (2002-2004) and then as President till the end of the mandate (2004-2006).

In 2006 he was elected for the third time Mayor of Olenia Municipality, and he had a second mandate as President of the of the Union of Municipalities and Communities of the Achaia Prefecture. Moreover, in 2008 he was elected President of the Waste Management Association of the Achaia Prefecture.

In the Regional Elections of November 2010, he was elected Governor of Achaia Regional Unit and he was appointed as Deputy of the Governor of Western Greece Region. In the Regional Elections in 2014, he was re-elected in his duties. he continued in the position of Deputy Regional Governor of Achaia.

In the Municipal 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.

In the elections of October (15.10.2023), he was elected Mayor of Western Achaia, while he was re-elected President of the Solid Waste Management Association of the Prefecture of Achaia and member of the Board of Directors of the Central Union of Municipalities in Greece.

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.