Ack van Rooyen's career in the jazz circuit and as a studio musician covers a broad spectrum. Born on New Year's day 1930, he graduated cum laude from the Royal Conservatory of the Hague in 1949. He subsequently joined the Arnhem Symphony Orchestra where he played until 1952. In the meantime his interests were turning more to jazz and improvistation.

On a student trip to the United States with his brother Jerry an Rob Pronk, they heard the new sounds being created on the New York's 52nd street and were among the first to introduce the New Music to Holland.

A period of interaction with leading musicians in larger and smaller formations throughout Europe followed. Returning to Holland he established himself in the Hilversum studio's. Than to France for three years playing with the Aimé Barelli Orchestra during which time he was also active on the Paris jazz scene.

Moving on to Germany, Ack joined the newly formed SFB Bigband in Berlin, and later the SDR Orchestra in Stuttgart. During this period he toured and recorded with the Bert Kaempfert Orchestra as a featured soloist. Together with Wolfgang Dauner and Albert Mangelsdorff he toured Asia and South America. He is a charter member of the United jazz and Rock Ensemble as well as Peter Herbolzheimer's Rhythm combination and brass. He has played with Clark Terry and the Gil Evans Orchestra on their European tours.

Prensently Ack is based in Holland where he works with his own quintet, the Dutch Jazz Orchestra, the Jazz orchestra of the COncertgebouw and in Duo with Joerg Reiter. He teaches the Royal Conservatory of the Hague and leads workshops and coaches Bigbands throughout Europe.

JAZZ "KNIGHT" 2006
September 9th 2006 "King Wolfgang Ernst from "Ysenburg und Büdungen" made trompeter Ack van Rooyen “Knight Of Ronnenburg" .