He subsequently studied with Malcolm Bilson at Cornell University (Ithaca, NY) and received a Doctor of Musical Arts degree in Historical Performance Practice in 1993.
Van Oort has performed in many European countries and appeared at festivals in Utrecht, Florence, Berlin, Antwerp, Bruges, Melbourne, Brisbane, York, Clisson, Montpellier, and Esterhaza.
His diverse discography also includes Bohemian Songs with soprano Claron McFadden, the Mendelssohn Double Concerto for piano and violin, and Schubert Sonatas.
In 2003 the 4-CD box set The Art of the Nocturne in the Nineteenth Century, which included the complete Nocturnes of Field and Chopin as well as works by Pleyel, Kalkbrenner, Clara Schumann, Lefèbure-Wély, E. Weber, Alkan, Glinka, Szymanowska, and Dobrzynski, was awarded the highest rating (five tuning forks) by the French classical music magazine Diapason.
His first recording of Sonatas and Fantasies by Mozart (1998) was awarded a "10" by the Dutch CD magazine Luister, and a second volume appeared in 2001.