Elected Executive Committees:

Provisional International Crystallographic Committee, 1946 - 1948

President

P.P Ewald United Kingdom of Great Britain and Northern Ireland

General Secretary

Members

First General Assembly, 1948, Harvard, USA

President

Sir Lawrence Bragg United Kingdom of Great Britain and Northern Ireland

Vice-President

General Secretary

Editor

Members

Second General Assembly, 1951, Stockholm, Sweden

President

J.M Bijvoet Netherlands

Vice-President

General Secretary

Editor

Members

Third General Assembly, 1954, Paris, France

President

R.W.G Wyckoff United States of America

Vice-President

General Secretary

Members

Fourth General Assembly, 1957, Montreal, Canada

President

J Wyart France

Vice-President

General Secretary

Retiring President

Members

Fifth General Assembly, 1960, Cambridge, UK

President

P.P Ewald United Kingdom of Great Britain and Northern Ireland

Vice-President

General Secretary

Retiring President

Members

Sixth General Assembly, 1963, Rome, Italy

President

J.D Bernal United Kingdom of Great Britain and Northern Ireland

Vice-President

General Secretary

Retiring President

Members

Seventh General Assembly, 1966, Moscow, USSR

President

N.V Belov USSR

Vice-President

General Secretary

Treasurer

Retiring President

Just before the Seventh General Assembly in 1966, the then President, J.D. Bernal, resigned for reasons of health. In accordance with By-Law 2.3 (version after amendation by the Sixth General Assembly), Dame Kathleen Lonsdale assumed the office of President until the close of the Seventh General Assembly.

Members

Eighth General Assembly, 1969, Stony Brook, USA

President

A Guinier France

Vice-President

General Secretary and Treasurer

G. Boom, who had been re-elected General Secretary at the Eighth General Assembly, resigned as from 3 April 1970. The Executive Committee recombined the offices of General Secretary and Treasurer and appointed D.W.J. Cruickshank, who had been re-elected Treasurer at the Eighth General Assembly, to this joint office as from 3 April 1970.

Immediate Past President

Members

Ninth General Assembly, 1972, Kyoto, Japan

President

D Hodgkin United Kingdom of Great Britain and Northern Ireland

Vice-President

General Secretary and Treasurer

Immediate Past President

Members

Tenth General Assembly, 1975, Amsterdam, The Netherlands

President

A Magnéli Sweden

Vice-President

General Secretary and Treasurer

Immediate Past President

Members

Eleventh General Assembly, 1978, Warsaw, Poland

President

N Kato Japan

Vice-President

General Secretary and Treasurer

Immediate Past President

Members

Twelfth General Assembly, 1981, Ottawa, Canada

President

J Karle United States of America

Vice-President

General Secretary and Treasurer

Immediate Past President

Members

Thirteenth General Assembly, 1984, Hamburg, Federal Republic of Germany

President

Th. Hahn Federal Republic of Germany

Vice-President

General Secretary and Treasurer

Immediate Past President

Members

Fourteenth General Assembly, 1987, Perth, Australia

President

M Nardelli Italy

Vice-President

General Secretary and Treasurer

Immediate Past President

Members

S.A. Semiletov was elected to serve for the period 1987-1993. However, he died in mid 1989. The Executive Committee co-opted V.I. Simonov to fill the vacancy thus created until the next General Assembly, in 1990, when an election was held to fill the vacancy.

Fifteenth General Assembly, 1990, Bordeaux, France

President

A Authier France

Vice-President

General Secretary and Treasurer

Immediate Past President

Members

Sixteenth General Assembly, 1993, Beijing, People's Republic of China

President

P Coppens United States of America

Vice-President

Professor Yu. T. Struchkov died in 1995. The Executive Committee appointed Dr R. Chidambaram as Vice-President until the close of the next General Assembly.

General Secretary and Treasurer

Professor A.I. Hordvik died in 1995. The Executive Committee appointed Professor S. Larsen as General Secretary and Treasurer until the close of the next General Assembly.

Immediate Past President

Members

Seventeenth General Assembly, 1996, Seattle, USA

President

E.N Baker New Zealand

Vice-President

General Secretary and Treasurer

Immediate Past President

Members

Eighteenth General Assembly, 1999, Glasgow, UK

President

H Schenk Netherlands

Vice-President

General Secretary and Treasurer

Immediate Past President

Members

Nineteenth General Assembly, 2002, Geneva, Switzerland

President

W.L Duax United States of America

Vice-President

General Secretary and Treasurer

Immediate Past President

Members

Twentieth General Assembly, 2005, Florence, Italy

President

Y Ohashi Japan

Vice-President

General Secretary and Treasurer

Immediate Past President

Members

Twenty-First General Assembly, 2008, Osaka, Japan

President

S Larsen Denmark

Vice-President

General Secretary and Treasurer

Immediate Past President

Members

L.T.J. Delbaere was elected to serve for the period 2008-2011. However, he died in 2009. The Executive Committee co-opted M.L. Hackert to fill the vacancy thus created until the close of the next General Assembly.