After graduation from high school in 1985, he entered the Royal Conservatory of Brussels (Belgium). He got degrees in music theory, piano, chamber music and keyboard harmony. His piano teacher here was Jean Brouwers. In 1989 he entered the Royal Flemish Conservatory in Antwerp (Belgium), where he studied with Jacques Detiège. He specialised in accompagniment and teaching. After 8 years, he restarted studying in September 2000 at the Zuid-Nederlandse Hogeschool voor Muziek at Tilburg (The Netherlands). Here he studied with Ton Demmers and received his Performance Degree in june 2002. He also studied Jazz and Improvised music with Willem Kühne.

Dagmar Feyen followed several master classes with Daniël Blumenthal (USA), Rolf Plagge (Germany), Alan Weiss (USA), Vladimir Tropp (Russia) and Jan Wijn (The Netherlands).

In 1985 en 1986 he became laureate at the National Music Competition (now Axion Classics) in the disciplines piano and accompagniment. He thereafter entered a few minor international competitions. Trio Concorde, with whom Dagmar played from 1988 till 1998, received in 1988 the Festival-Award at the prestigious Flandres Festival. In 1993 he received , as a composer, a price from the Belgian Artisitic Promotion (SABAM) for his work "Prelude, Cadenza and Fugue, opus 11" for percussion ensemble and keyboard.