In Holland Andres studied under the guidance of Wim Bronnenberg, Peter Nieuwerf, Eef Albers, John Ruocco and Hein v/d Geyn as main teachers but also attended workshops and masterclasses lead by musicians such as Michael Brecker, Kurt Rosenwinkel, John Abercrombie and Avishai Cohen as well as performing with the great Michael Brecker and the Royal Conservatory big band at a concert held in City Hal