Haris Mermigas was born in Athens and graduated from Fillipos Nakas Conservatory with a diploma in acoustic bass. He also attended seminars with Mc Tier, Toshev and Barbier and studied with various musicians and teachers such as Christos Komisopoulos.

Since 1993 he has been a member of the National Symphonic Orchestra of the National Radio and Television. He has also performed with many orchestras such as the National Opera, the Orchestra Chromaton and the Municipality of Athens Orchestra.

In 2010 he became a member of The Wonderfall Quartet and participated in the recording of the band's debut album.