The ISO was first established in 1957. The aim of the ISO is to provide a rich forum for the exchange of ideas and experience between organ builders from all over the world. This is achieved in a number of ways.

The ISO Journal

The ISO Journal is published three time a year and includes various articles submitted by members and occasionally others, describing instruments which have been built, re-built or restored, as well as related subjects such as scaling, tuning methods and the history of the organ. The ISO Journal is published in three languages, English, French and German so that all of our members are able to share the information.

The Biannual Congress

The biannual congresses of the ISO are the high point of the society's calendar. Each time we meet in a different country and are shewn the instruments of that country, learn of the history of the instruments and organbuilding and visit member's workshops.

The Workshops

These are smaller than congresses, generally numbering up to 30 participants, where a particular theme is dealt with in depth. They can comprise lectures, visits and practical instruction in whatever theme is being dealt with and generally last 3 to 4 days.


The ISO provides a closed email-based forum for its members only, where any member can pose questions to all the other members for consideration and assistance. It is most unusual for a question to go unanswered by somebody who has the experience and knowledge sought, and is given freely and most helpfully.

Apprentice Exchange

Our young organbuilders are also our future for organbuilding. The ISO encourages and can assist in the exchange of apprentices between organbuilding firms to afford these up and coming organbuilder the possibility of gaining experience outside the confines of the firm they are apprenticed with.

World Wide Representation of Organbuilders' Interests

Occasionally, issues arise which may have an impact on organbuilding the world over, or even in a particular region of the world. One of the objects of the ISO is to keep an eye on such developments and to take an active role in addressing any issues which might arise and be of concern to the continuation of our craft.

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After apprenticeship and working in various companies in Switzerland, England, France an Japan, Peter set up is own workshop in Rheinfelden, Switzerland in 2004. He is fascinated by the unique combination in our profess

Peter Meier
Board member

In 1986 he started his apprenticeship at the Sueddeutsche Orgelpfeifenfabrik Roland Killinger to become a pipe maker with educational at the Oscar Walcker Schule in Ludwigsburg, Germany. In 1989 he worked at the Killinger - reed making and voicing. Since 1995 workshop manager at Killinger. 2002 - CEO of KILLINGER PFEIFEN FREIBERG

Christoph Ulmer
Board member

Andrew joined Harrison & Harrison as an apprentice in 1994. At the age of 22 he became London Tuner. In 2012 Andrew has been responsible for the musical success of many projects, including the Royal Festival Hall and Ki

Andrew Scott
Board member

Martin Pasi
2nd ISO vice president and Secretary

Catarina Grönlund fourth generation of organbuilders in the Grönlund family and Company. She has since 1980 worked as organbuilder. Now she is managing director and also works with design, technical drawing, service and in the workshop.

Catarina Gronlund
Board member

Director and co-owner of Orgelbau Goll Luzern, Switzerland. He started his organbuilding apprenticeship after high school graduation, education in architecture and music. He is dedicated to the formation of young Swiss organbuilders.

Simon Hebeisen
board member

Studied « history of art and musicology » (master thesis: “La facture d’orgues liégeoise au XVIII siècle: la dynastie des Le Picard et Robustelly” Musical studies at the Conservatoire Royal de Musique de Liège. Working since 1984 in the family business. P

Guido Schumacher
ISO treasurer

Organbuilder since 1973. Apprenticeship at his father's shop, with Vier/Oberweiher (both Germany) and with Phelps, Erie, PA (USA).

Klaus Rensch
ISO Journal Editor

In 1976, Bertrand Cattiaux startet his apprenticeship at Jean-Loup Boisseau in Poitiers. Associated with him for 20 years (Boisseau-Cattiaux), he founded the Atelier Bertrand Cattiaux in Liourdres in the south-west of France in 1998. The company has 8 employees. Bertrand Cattiaux has been an ISO member since 1998 and has organized several workshops around French harmony.

Bertrand Cattiaux
1st ISO vice president

Didier Grassins interest in organbulding began in the shadow the famous Clicquot organ of Poitiers, France, his native town. His professional path took him through several years as freelance designer, working for many m

Didier Grassin
ISO president

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