Piet Kuijken was a student of Jan Vermeulen and then, at the Brussels Royal Conservatory, of Jan Michiels, André de Groote and Arie van Lysebeth; graduating magna cum laude in piano and summa com lauda in chamber music.
He won a number of national competitions for young musicians, in particular the CERA "Jeugd en Muziek" Prize in 1994 and the Axion Classics Competition.
In 2002-2001 he was given a fellowship of the Belgian American Educational Foundation to study at the Indiana University at Bloomington with Menahem Pressler. He obtained the Performer Diploma and took diverse master classes, with Hokanson, Auer, Rosenbaum, Grossley, Collard and others. He was the pianist of the University's New Music Ensemble and won the Schumann Concerto Competition, wich led to a concert in the Musical Arts Center with the Symphony Orchestra conducted by Ze'ev Dorman. This was followed by a number of solo and chamber music performances, one of wich included a world premiere, and a recording of a CD wit contemporary works bu Indiana University professors.

Piet Kuijken has worked with several orchestras and has given many solo recitals and chamber music concerts in Europe, Japan and the USA. He plays the harpsichord and the pianoforte as well as the modern piano, and his repertoire stretches from baroque to contemporary music. He has also been a guest at many festivals, both at home and abroad.
He has been a premanent member of the Prometheus Ensemble since 1998. He regulary plays with various ensembles and duos, e.g. with his father Wieland Kuijken and with the cellist Karel Steylaerts.
His recordings include two CD's witch works by Luc van Hove, performed with the Prometheus Ensemble, and of chamber music by Claude Debussy, performed with the Kuijken family; the later CD obtained a "Prix Choc du Monde de la Musique 2000".

Since 1995 he has been a piano teacher at the Anderlecht Music academy as well as its accompanist; and iin October 2002 he was apointed guest lecturer to teach the piano at the Brussels Royal Conservatory.