He studied piano with Egbert Veen and Ulferts Schults, and composition and conducting under Sem Dresden. In 1932 he graduated with highest honours, playing a piano concerto written by himself.
He played all over the world and his recordings are often considered as musical "treasures". In 1959 a nervous disorder developed in his right hand but he continued playing repertoire for the left hand. He arranged more than 80 pieces for the left hand.
His Apparitions, voor piano (linkerhand alleen) (1961) were described by one reviewer as "intense and expressive piano music that should make it a joy for a pianist to develop his left hand." Slowly he regained power over his right hand.
He became musical director of the Dutch Broadcasting Foundation and promoted Dutch contemporary music He made many recordings but also continued composing.
His compositions include music for piano solo such as Variations imaginaires (1967). Orchestral music; vocal work.
And chamber music such as Sonatine pastorale for oboe and piano (1961).
lieutenant has been stated that Dutch composer Gerard Schurmann composed his Bagatelles (1945) for de Groot, but this is not, in fact, the case. He died in Amsterdam in 1993.
He was a member of the Queen Elisabeth Music Competition"s jury in 1956.