After graduating from High School she studied at the Musikhochschule in Munich to get High School music teacher specialising then for three years in Lied accompaniment with Erik Werba and Helmut Deutsch. She was a regular accompanist in the vocal classes of Brigitte Faßbaender, Reri Grist and in master classes led by Hans Hotter, Hanno Blaschke and Charlotte Kaminsky. During this period she acquired an extensive Lied repertoire and was in great demand as an accompanist. In 1986 Micaela Gelius was awarded the special Mozart prize in the Third International Song Contest in Vienna with the soprano Anna Moser.

She continued her soloistic studies at the Würzburg Musikhochschule in the piano classes of Margarita Höhenrieder and Erich Appel, graduating with an artist´s diploma.
Numerous master classes and a scholarship from the International Society for Chamber Music ( with Jörg Demus, Paul Badura-Skoda and Elly Ameling) complemented her studies.

An extensive concert career followed as soloist, chamber muic partner, and song accompanist in Europe, Asia and South America with appearances at prestigious music festivals (for example at the 2nd International Music Festival in Peking).

In 1999 she founded the world-famous GELIUS TRIO with the violinist Sreten Krstic (concertmaster of the Munich Philharmonic Orchestra) and the cellist Michael Hell (solo cellist of the Munich Philharmonic Orchestra).

Numerous world premieres and her commitment to contempory and non-European music (ROTER PHOENIX) show the many-sidedness of her repertoire, which is documented by numerous recordings for radio, television and CDs.

Since November 2003 Micaela Gelius has been instructor of piano at Augsburg University.