Wim Leising (Haarlem, 1955) studied piano at the Conservatorium van Amsterdam with Truus Tichelman, Daniëlle Dechenne, and Willem Brons, and musicology at the University of Amsterdam. He performs frequently as a chamber music player and accompanist.
From 1990 his primary focus has mainly concerned conducting, which involves a particular passion for musical theater productions. In this capacity he has established the Ouderkoor of the Vrije School choir in Haarlem, with which he performed masses and operas by Henry Purcell, Christoph Willibald Gluck, Carl Maria von Weber, and Carl Orff (Carmina burana). He also staged operettas with the N.O.G. Muziektheater at the Haarlemse Stadsschouwburg for ten years.
Since 1995 he has conducted the Spaarndams Gemengd Koor choir, with which he performed De schipbreuk by Johan Wagenaar, a grand Opera-Operetta concert in the Concertgebouw of Haarlem, and the Verdi Kolk Concert in 2001. He has been the conductor for the Stichtse Muziektheatergezelschap Polyhymnia in Zeist since 2002, and he was the conductor and répétiteur for the OZG Orpheus in Amsterdam from 2005 to 2007. In the latter capacity he has been connected to the Stichting Opera in het Theater since 2014.