2009 Tokyo, Japan, Meiji Gakuin University.

New organ with 33 stops, on Manuaal, Rugwerk and Pedaal.

Consultant: Jacques van Oortmerssen, organiste titulaire of the Waalse Kerk in Amsterdam.

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2009 Amsterdam, Waalse Kerk.

Restoration of the eighteenth century cabinet organ.

Consultant: Jacques van Oortmerssen, organiste titulaire of the Waalse Kerk in Amsterdam.

2007 Rheden, Dorpskerk.

Restoration of the Abraham Meere secretary organ from 1816 (I/4).

2007 Vianen, Protestantse Kerk 'De Hoeksteen'.

Restoration of the Kam en Van der Meulen salon organ from 1844 (I/6).
Consultant: Peter van Dijk.
On behalf of the National Service for Archaeology, Cultural Landscape and Built Heritage (RACM) the restoration was approved by Drs. Wim Diepenhorst.

2006 Oegstgeest, Gereformeerde Kerk vrijgemaakt.

Installation of the Blank organ from 1973 (I P/8), originating from the Hervormde Verzoeningskerk in Rijswijk (ZH).
Revision of the reed stops and re-tuning to mean tone temperament.

The organ is lent by the reverend Dr. R.D. Anderson of Katwijk (ZH).

2005 Den Haag, Grote of St.-Jacobskerk.

Restoration of the Müller cabinet organ (I /8) from about 1755.
Consultant: Ben van Oosten, organist of the Grote or St.-Jacobskerk in The Hague.
On behalf of the Netherlands Department of Conservation, the project was accompanied by Rudi van Straten.

2005 Rijssen, Noorderkerk.

New 16' organ of 32 stops on Manuaal, Rugwerk and Pedaal.
Consultant: Professor Harald Vogel of Osterholz-Scharmbeck, director of the North-German Organ Academy and Professor of Organ at the Hochschule für Künste in Bremen.

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2004 Tokyo, Japan, Meiji Gakuin universiteit.

New continuo organ with three stops.
Consultant: Jacques van Oortmerssen, organiste titulaire of the Waalse Kerk in Amsterdam.

2003 Haarlem, Waalse Kerk.

Restoration of the Strümphler/Friedrichs organ from 1808. Installation of a new wind supply with three wedge bellows as well as four new reed stops.
Consultants: Dr. Hans van Nieuwkoop, organist of Grote or St. Laurenskerk in Alkmaar and city organist of Alkmaar, as well as Drs. Wim Diepenhorst, organist of the Oude Lutherse Kerk in Amsterdam and organ consultant of the Netherlands Department of Conservation.
On behalf of the Netherlands Department of Conservation, the project was accompanied by Rudi van Straten.

2002 Wamel, Hervormde Kerk.

Restoration and reconstruction of the Knipscheer organ (I p/5) from 1865. Consultant: Aart Bergwerff, organist of the Lutherse Kerk in The Hague.
On behalf of the Netherlands Department of Conservation, the project was accompanied by Rudi van Straten.

2002 Hoogblokland, Hervormde Kerk.

New 8' organ with 13 stops on Manuaal, Positief and Pedaal, in the old organ case of the organ builder Van den Bijlaardt from 1901. 116 pipes of the organ builder J.J.Vollebregt (1791-1872) of 's-Hertogenbosch served as a point of departure for the new organ.
Consultants: Dr. Hans van Nieuwkoop, organist of Grote or St. Laurenskerk in Alkmaar and city organist of Alkmaar, as well as Aart Bergwerff, organist of the Lutherse Kerk in The Hague.

2002 Ermelo, Hervormde Westerkerk.

New 8' organ with 18 stops on Manuaal, Bovenwerk and Pedaal.

2001 Anloo, Magnuskerk.

New independent Pedal of 4 stops in addition to the Radeker/Garrels organ from 1719.
Consultant: Professor Harald Vogel of Osterholz-Scharmbeck, director of the North-German Organ Academy and Professor of Organ at the Hochschule für Künste in Bremen.

2001 Hoogkeppel, Hervormde Kerk.

Extensive cleaning and maintenance of the Mattijs van Deventer organ (I/9) from 1740.

2001 Roodeschool, Gereformeerde Kerk vrijgemaakt.

Reconstruction of the Eertman organ (I p/9) from 1908, including replacement of all pipes.

© Photo: Edwin Rittersma

2001 Lathum, Hervormde Kerk.

Second phase of the restoration of the oldest cabinet organ in The Netherlands (I/6), built in 1736 by Pieter Keerman in Amsterdam.
Consultant: Rudi van Straten, organist of the Hervormde Kerk in Vorden and senior organ consultant of the Netherlands Department of Conservation.

2000 Amsterdam, Waalse Kerk.

Restoration of the windchest and repair of the façade pipes of the Rugwerk of the Christian Müller organ (II P/26) from 1734.
Consultant: Jacques van Oortmerssen, organiste titulaire of the Waalse Kerk.

© Photo: Dick Sanderman

2000 Alphen aan den Rijn, Oudshoornse Kerk.

Maintenance of the Hermanus Hess organ from (II P/20) 1783, re-voicing of Prestant 8', Trompet 8' and Vox Humana 8'.
Consultant: Jan Jongepier, organist of the Grote of Jacobijnerkerk in Leeuwarden.

2000 Amsterdam, Oude Kerk.

Extensive cleaning of the main Vater/Müller organ from 1726 (III P/54). Consultants: Dr. Gustav Leonhardt and Jacques van Oortmerssen.

© Photo: Dick Sanderman

2000 Gothenburg, Sweden, North German Organ Research Project.

New organ in north German baroque style (IV P/54) for the University of Gothenburg, in close collaboration with the organ builders Mats Arvidsson and Munetaka Yokota.
Consultants: Dr. Hans Davidsson of Gothenburg and professor Harald Vogel of Osterholz-Scharmbeck.

Participant in interdisciplinary research preparatory to this organ, in collaboration with the Göteborg Organ Art Center (Dr. Hans Davidsson,
Drs. Paul Peeters) and the Chalmers University of Technology in Gothenburg (Prof. Mendel Kleiner, Prof. Bror-Arne Gustafson, Dr. Milan Friesel).

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© Photo: Ulf Celander

1999 Sluipwijk, Hervormde Kerk.

New organ with 11 stops on Manuaal and Pedaal.
Consultant: Aart Bergwerff, organist of the Lutherse Kerk in The Hague.

© Photo: Max Milikan

1999 Amersfoort, Oud-Katholieke Kerk van de H. Georgius.

Restoration of the August Gern organ from 1872 (II P/13).
Consultant: Dr. Hans van Nieuwkoop, organist of the Grote or St. Laurenskerk in Alkmaar, city organist of Alkmaar and councilor of the Oud-Katholieke Orgelraad.

© Photo: Jan Schuring

1999 Anloo, Magnuskerk.

Restoration and reconstruction of the Radeker/Garrels organ from 1719
(II p/17).
Consultants: Professor Harald Vogel of Osterholz-Scharmbeck, director of the North-German Organ Academy and Professor of Organ at the Hochschule für Künste in Bremen and Stef Tuinstra of Groningen.
On behalf of the Netherlands Department of Conservation, the project was accompanied by Onno. B. Wiersma and Rudi van Straten.

1999 Amsterdam, Oude Kerk.

Cleaning of the choir organ from 1658 (II P/17).
Consultant: Dr. Gustav Leonhardt of Amsterdam.

© Photo: Dick Sanderman

1999 Falun, Zweden, Stora Kopparbergskyrka.

Delivery of the organ built by William Hill and sons in 1914 as opus 2444 with 10 stops on Great, Swell and Pedal.
In 2000/2001 the organ was restored by Tore Johansson/Tostareds Kyrkorgelfabrik, Tostareds, Sweden.
Consultant: Mats Åberg, Falun.

© Photo: Mikael Forslund

1996 Rijswijk (Gld). Hervormde Kerk.

Restoration of the Bätz-Witte organ (II P/9) from 1875.
Consultant: Dr. Hans van Nieuwkoop, organist of the Grote or St. Laurenskerk in Alkmaar and city organist of Alkmaar.

© Photo: Max Milikan

1994 Etten-Leur. Former Hervormde Kerk, now town hall.

New organ (I p/9) in the organ case from 1699 of Jacobus Zeemans, using some pipes from 1699 and 1815.
Consultant: Dr. Hans van Nieuwkoop, organist of Grote or St. Laurenskerk in Alkmaar and city organist of Alkmaar.
On behalf of the Netherlands Department of Conservation, the project was accompanied by Onno. B. Wiersma and Rudi van Straten.

© Photo: Max Milikan

1994 Helsinki, Finland. Sibelius Academi.

Delivery of the Forster & Andrews organ from 1892 with 30 stops on Great, Choir, Swell en Pedal, originally built for the United Presbyterian Church in Houtchesontown Glasgow.

1993 Amsterdam, Waalse Kerk.

Renovation of the Christian Müller organ (1734) in the Waalse Kerk (II P/26). Consultant: Jacques van Oortmerssen, organiste titulaire of the Waalse Kerk in Amsterdam.
On behalf of the Netherlands Department of Conservation, the project was accompanied by Onno. B. Wiersma.

1992 Bunschoten, Gereformeerde Immanuelkerk.

New 8' organ with 18 stops + 3 reservations on Manuaal, Positief and Pedaal. Consultant: Drs. Hans van der Harst.

© Photo: Max Milikan

1992 Gothenburg, Sweden.

Delivery of the ’Father’ Willis organ with 31 stops on Great, Choir, Swell and Pedal, built in 1871 for St. Stephen's Church in Hampstead, London.

In 1993, the Willis organ was temporarily installed in ’Artisten’, the building of the School of Music in Gothenburg, by Tore Johansson/Tostareds Kyrkorgelfabrik, Tostareds, Sweden.

In 1998 the Willis organ was restored by Tore Johansson/Tostareds Kyrkorgelfabrik and installed in the north transept of Örgryte Nya Kirka, Gothenburg.

1989 Dordrecht. Oud-Katholieke Kerk H. Maria Maior.

Restoration, reconstruction and extension of the Kam & Van der Meulen organ (II P/11) from 1844.
Consultant: Klaas Bolt organist of the Grote or St.-Bavokerk in Haarlem and councillor of the Oud-Katholieke Orgelraad.
On behalf of the Netherlands Department of Conservation, the project was accompanied by Onno. B. Wiersma.

1987 't Woudt. Hervormde Kerk.

Renovation and alteration of the De Koff-organ (II P/9).
Consultant: Jacques van Oortmerssen, ’organiste titulaire’ of the Waalse Kerk in Amsterdam.

© Photo: Max Milikan

1986 Zwartewaal. Hervormde Kerk.

Restoration of the Bakker & Timmenga organ from 1902 (II P/15).
Consultant: Klaas Bolt, organist of the Grote or St.-Bavokerk in Haarlem.

© Photo: Wim Haveman

1985 Amersfoort, Bergkerk.

New continuo organ (I/3).
Consultant: Gerrit 't Hart, organist of the Bergkerk in Amersfoort.

1984 Leusden, Gereformeerde Kerk ’De Koningshof’.

New 8' organ with 11 stops on Manuaal and Pedaal.
Consultant: Willem Hülsmann, organist of the St. Joriskerk in Amersfoort.