In 1957, he studied with Professor Anton Heiller (Wien).
In 1959, scholar of the French state, he was a pupil of Gaston Litaize (Paris), and then continued his studies at the National Conservatory of Paris in the “foreign” class for the direction of Robert Blot Orchestra.
1964 First prize in Bruges, 1969 press service of Copenhagen Art Prize 1972 Award of Honour of Professor Ove Christensen.
Organist (Domorganist) at the Copenhagen Cathedral (1972).
Until 1975, he was professor of organ at the music school in Aalborg and was a jury member at international organ competitions (1976, jury member of the International Competition of Chartres, 1986 Member of the Competition Jury Dublin International.
Niels Henrik Nielsen has played throughout Europe, USA, Japan, Singapore and Taiwan, and has become an expert in romantic music and one of the best Danish interpreters of Olivier Messiaen. He has participated in various radio and television, recording numerous CDs.