Elected Executive Committees:

Provisional International Crystallographic Committee, 1946 - 1948

President

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

General Secretary

R.C Evans (United Kingdom of Great Britain and Northern Ireland)

Members

M.J Buerger (United States of America)
D Harker (United States of America)
J.A.A Ketelaar (Netherlands)
C Mauguin (France)
A.V Shubnikov (USSR)
W.H Taylor (United Kingdom of Great Britain and Northern Ireland)

First General Assembly, 1948, Harvard, USA

President

Sir Lawrence Bragg (United Kingdom of Great Britain and Northern Ireland)

Vice-President

A Westgren (Sweden)
R.W.G Wyckoff (United States of America)

General Secretary

R.C Evans (United Kingdom of Great Britain and Northern Ireland)

Editor

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

Members

M.J Buerger (United States of America)
A.L Patterson (United States of America)
J Wyart (France)

Second General Assembly, 1951, Stockholm, Sweden

President

J.M Bijvoet (Netherlands)

Vice-President

G Hägg (Sweden)
J Wyart (France)

General Secretary

R.C Evans (United Kingdom of Great Britain and Northern Ireland)

Editor

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

Members

J.D Bernal (United Kingdom of Great Britain and Northern Ireland)
Sir K.S Krishnan (India)
E Onorato (Italy)
A.L Patterson (United States of America)

Third General Assembly, 1954, Paris, France

President

R.W.G Wyckoff (United States of America)

Vice-President

P.P Ewald (United Kingdom of Great Britain and Northern Ireland)
G Hägg (Sweden)

General Secretary

D.W Smits (Netherlands)

Members

J.D Bernal (United Kingdom of Great Britain and Northern Ireland)
N.V Belov (USSR)
A Guinier (France)
A Tovborg Jensen (Denmark)
C.H MacGillavry (Netherlands)
A.J.C Wilson (United Kingdom of Great Britain and Northern Ireland)

Fourth General Assembly, 1957, Montreal, Canada

President

J Wyart (France)

Vice-President

P.P Ewald (United Kingdom of Great Britain and Northern Ireland)
N.V Belov (USSR)

General Secretary

D.W Smits (Netherlands)

Retiring President

R.W.G Wyckoff (United States of America)

Members

O.C.A Bastiansen (Norway)
A Guinier (France)
F.H Laves (Switzerland)
C.H MacGillavry (Netherlands)
I Nitta (Japan)
A.J.C Wilson (United Kingdom of Great Britain and Northern Ireland)

Fifth General Assembly, 1960, Cambridge, UK

President

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

Vice-President

N.V Belov (USSR)
Dame Kathleen Lonsdale (United Kingdom of Great Britain and Northern Ireland)

General Secretary

D.W Smits (Netherlands)

Retiring President

J Wyart (France)

Members

W.H Barnes (Canada)
O.C.A Bastiansen (Norway)
F.H Laves (Switzerland)
I Nitta (Japan)
B.E Warren (United States of America)
G.S Zhdanov (USSR)

Sixth General Assembly, 1963, Rome, Italy

President

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

Vice-President

Dame Kathleen Lonsdale (United Kingdom of Great Britain and Northern Ireland)
I Nitta (Japan)

General Secretary

D.W Smits (Netherlands)

Retiring President

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

Members

W.H Barnes (Canada)
J.M Cowley (Australia)
H Curien (France)
H Jagodzinski (Federal Republic of Germany)
B.E Warren (United States of America)
G.S Zhdanov (USSR)

Seventh General Assembly, 1966, Moscow, USSR

President

N.V Belov (USSR)

Vice-President

I Nitta (Japan)
B.E Warren (United States of America)

General Secretary

G Boom (Netherlands)

Treasurer

D.W.J Cruickshank (United Kingdom of Great Britain and Northern Ireland)

Retiring President

Dame Kathleen Lonsdale (United Kingdom of Great Britain and Northern Ireland)

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

J.M Cowley (Australia)
H Curien (France)
H Jagodzinski (Federal Republic of Germany)
A Línek (Czechoslovakia)
A.M Liquori (Italy)
W.H Zachariasen (United States of America)

Eighth General Assembly, 1969, Stony Brook, USA

President

A Guinier (France)

Vice-President

B.E Warren (United States of America)
F.H Laves (Switzerland)

General Secretary and Treasurer

D.W.J Cruickshank (United Kingdom of Great Britain and Northern Ireland)

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

N.V Belov (USSR)

Members

D Hodgkin (United Kingdom of Great Britain and Northern Ireland)
N Kato (Japan)
A Línek (Czechoslovakia)
A. McL. Mathieson (Australia)
B.K Vainshtein (USSR)
W.H Zachariasen (United States of America)

Ninth General Assembly, 1972, Kyoto, Japan

President

D Hodgkin (United Kingdom of Great Britain and Northern Ireland)

Vice-President

H Jagodzinski (Federal Republic of Germany)

General Secretary and Treasurer

S.E Rasmussen (Denmark)

Immediate Past President

A Guinier (France)

Members

N Kato (Japan)
K Lukaszewicz (Poland)
A Magnéli (Sweden)
A. McL. Mathieson (Australia)
D.P Shoemaker (United States of America)
B.K Vainshtein (USSR)

Tenth General Assembly, 1975, Amsterdam, The Netherlands

President

A Magnéli (Sweden)

Vice-President

B.K Vainshtein (USSR)

General Secretary and Treasurer

S.E Rasmussen (Denmark)

Immediate Past President

D Hodgkin (United Kingdom of Great Britain and Northern Ireland)

Members

F.R Ahmed (Canada)
E.F Bertaut (France)
K Kuchitsu (Japan)
K Lukaszewicz (Poland)
S Ramaseshan (India)
D.P Shoemaker (United States of America)

Eleventh General Assembly, 1978, Warsaw, Poland

President

N Kato (Japan)

Vice-President

A.J.C Wilson (United Kingdom of Great Britain and Northern Ireland)

General Secretary and Treasurer

S.E Rasmussen (Denmark)

Immediate Past President

A Magnéli (Sweden)

Members

F.R Ahmed (Canada)
E.F Bertaut (France)
J Karle (United States of America)
H Neels (German Democratic Republic)
S Ramaseshan (India)
V.I Simonov (USSR)

Twelfth General Assembly, 1981, Ottawa, Canada

President

J Karle (United States of America)

Vice-President

S Ramaseshan (India)

General Secretary and Treasurer

K.V.J Kurki-Suonio (Finland)

Immediate Past President

N Kato (Japan)

Members

S Amelinckx (Belgium)
Th. Hahn (Federal Republic of Germany)
M Nardelli (Italy)
H Neels (German Democratic Republic)
V.I Simonov (USSR)
M.M Woolfson (United Kingdom of Great Britain and Northern Ireland)

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

President

Th. Hahn (Federal Republic of Germany)

Vice-President

V.I Simonov (USSR)

General Secretary and Treasurer

K.V.J Kurki-Suonio (Finland)

Immediate Past President

J Karle (United States of America)

Members

A Authier (France)
R Diamond (United Kingdom of Great Britain and Northern Ireland)
A Kalman (Hungary)
E.N Maslen (Australia)
M Nardelli (Italy)
Y.-q Tang (China)

Fourteenth General Assembly, 1987, Perth, Australia

President

M Nardelli (Italy)

Vice-President

Y.-q Tang (China)

General Secretary and Treasurer

A.I Hordvik (Norway)

Immediate Past President

Th. Hahn (Federal Republic of Germany)

Members

A Authier (France)
P Coppens (United States of America)
R Diamond (United Kingdom of Great Britain and Northern Ireland)
A Kalman (Hungary)
E.N Maslen (Australia)
V.I Simonov (USSR)

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

A Kalman (Hungary)

General Secretary and Treasurer

A.I Hordvik (Norway)

Immediate Past President

M Nardelli (Italy)

Members

R Chidambaram (India)
P.W Codding (Canada)
P Coppens (United States of America)
R Diamond (United Kingdom of Great Britain and Northern Ireland)
J Harada (Japan)
Yu.T Struchkov (USSR)

Sixteenth General Assembly, 1993, Beijing, Peoples Republic of China

President

P Coppens (United States of America)

Vice-President

Yu.T Struchkov (USSR)

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

A.I Hordvik (Norway)

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

A Authier (France)

Members

E.N Baker (New Zealand)
R Chidambaram (India)
P.W Codding (Canada)
J Harada (Japan)
M Hart (United Kingdom of Great Britain and Northern Ireland)
H Schenk (Netherlands)

Seventeenth General Assembly, 1996, Seattle, USA

President

E.N Baker (New Zealand)

Vice-President

R Chidambaram (India)

General Secretary and Treasurer

S Larsen (Denmark)

Immediate Past President

P Coppens (United States of America)

Members

L.A Aslanov (Russian Federation)
J.C.A Boeyens (South Africa)
H Fuess (Germany)
M Hart (United Kingdom of Great Britain and Northern Ireland)
H Schenk (Netherlands)
M Tanaka (Japan)

Eighteenth General Assembly, 1999, Glasgow, UK

President

H Schenk (Netherlands)

Vice-President

M Tanaka (Japan)

General Secretary and Treasurer

S Larsen (Denmark)

Immediate Past President

E.N Baker (New Zealand)

Members

L.A Aslanov (Russian Federation)
J.C.A Boeyens (South Africa)
M.A Carrondo (Portugal)
W.L Duax (United States of America)
H Fuess (Germany)
Z Zhang (China)

Nineteenth General Assembly, 2002, Geneva, Switzerland

President

W.L Duax (United States of America)

Vice-President

L.A Aslanov (Russian Federation)

General Secretary and Treasurer

S Larsen (Denmark)

Immediate Past President

H Schenk (Netherlands)

Members

M.A Carrondo (Portugal)
G Heger (Germany)
Y Ohashi (Japan)
I Torriani (Brazil)
D Viterbo (Italy)
Z Zhang (China)

Twentieth General Assembly, 2005, Florence, Italy

President

Y Ohashi (Japan)

Vice-President

I Torriani (Brazil)

General Secretary and Treasurer

S Lidin (Sweden)

Immediate Past President

W.L Duax (United States of America)

Members

P.M Colman (Australia)
G.R Desiraju (India)
C.J Gilmore (United Kingdom of Great Britain and Northern Ireland)
G Heger (Germany)
C Lecomte (France)
D Viterbo (Italy)

Twenty-First General Assembly, 2008, Osaka, Japan

President

S Larsen (Denmark)

Vice-President

P.M Colman (Australia)

General Secretary and Treasurer

S Lidin (Sweden)

Immediate Past President

Y Ohashi (Japan)

Members

E Boldyreva (Russian Federation)
L.T.J Delbaere (Canada)
G.R Desiraju (India)
C.J Gilmore (United Kingdom of Great Britain and Northern Ireland)
C Lecomte (France)
J.M Perez-Mato (Spain)

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.

Twenty-Second General Assembly, 2011, Madrid, Spain

President

G.R Desiraju (India)

Vice-President

C Lecomte (France)

General Secretary and Treasurer

L Van meervelt (Belgium)

Immediate Past President

S Larsen (Denmark)

Members

E Boldyreva (Russian Federation)
H.A Dabkowska (Canada)
W Depmeier (Germany)
J.M Guss (Australia)
M.L Hackert (United States of America)
J.M Perez-Mato (Spain)

Twenty-Third General Assembly, 2014, Montreal, Canada

President

M.L Hackert (United States of America)

Vice-President

A.M Glazer (United Kingdom of Great Britain and Northern Ireland)

General Secretary and Treasurer

L Van meervelt (Belgium)

Immediate Past President

G.R Desiraju (India)

Members

H.A Dabkowska (Canada)
W Depmeier (Germany)
Professor S Garcia-Granda (Spain)
J.M Guss (Australia)
R Kuzel (Czech Republic)
M Takata (Japan)

Twenty-Fourth General Assembly, 2017, Hyderabad, India

President

S Lidin (Sweden)

Vice-President

H.A Dabkowska (Canada)

General Secretary and Treasurer

L Van meervelt (Belgium)

Immediate Past President

M.L Hackert (United States of America)

Members

W Depmeier (Germany)
G.C Diaz De Delgado (Venezuela)
Professor S Garcia-Granda (Spain)
R Kuzel (Czech Republic)
J.L Martin (Australia)
M Takata (Japan)

Twenty-Fifth General Assembly, 2021, Prague, Czech Republic

President

H.A Dabkowska (Canada)

Vice-President

Professor S Garcia-Granda (Spain)

General Secretary and Treasurer

B Brummerstedt Iversen (Denmark)

Immediate Past President

S Lidin (Sweden)

Members

Dr A Altomare (Italy)
G.C Diaz De Delgado (Venezuela)
J.L Martin (Australia)
Dr T Proffen (United States of America)
M Takata (Japan)
Dr M Weiss (Germany)

Twenty-Sixth General Assembly, 2023, Melbourne, Australia

President

Professor S Garcia-Granda (Spain)

Vice-President

G.C Diaz De Delgado (Venezuela)

General Secretary and Treasurer

V Forsyth (Sweden)

Immediate Past President

H.A Dabkowska (Canada)

Members

Dr A Altomare (Italy)
Professor S Bourne (South Africa)
Professor A Nakagawa (Japan)
Dr T Proffen (United States of America)
Dr M Weiss (Germany)
M.C Nonato (Brazil)