Plesssas Mimis was born in Athens in 1924. He studied at the Department of Mathematics and Physics of the National and Kapodistrian Universtiy of Athens (UoA) and continued his studies in the USA. In 1952, at the age of 27 years old, he was awarded with the first prize in music by the University of Minnesota and the following year he classified the fifth place among the best pianists in the USA. At this period he took more interest in composition and a few years later he started working in a professional level as a composer and as a conductor.

He is one of the most known artists of the Greek music scene with very rich activity in composing and performing, for more than 50 years, in all the fields of music, including music for the theater, the cinema, the radio and the television.
He has collaborated with many well known Greek singers for whom he has written some songs that have become hits. As a conductor, he has conduced exceptional orchestras around the world and he has obtained many awards in Greece and abroad.

Plessas Mimis was the radio producer of a very popular radio show, during the 60's - 70's. Also, he took part in many international and national artistic commitees and in addition he participated in established artistic associations.