| Avila, Nicholas C. | Nicholas C. Avila | Director | 2001 | 1 | |
| Azimioara, Laurent | Laurent Azimioara | Director | 2006 | 1 | |
| Ardal, Maja | Maja Ardal | Director | 2007 | 1 | |
| Avellaneda, María Herminia | María Herminia Avellaneda | Director | 1972 - 1997 | 2 | |
| Adlam, Nathalie | Nathalie Adlam | Director | 2015 | 1 | |
| Arnold, Andy | Andy Arnold | Director | 2015 | 1 | |
| Anderson, Carolyn | Carolyn Anderson | Director | 2006 | 1 | |
| Amshoff, Kathleen | Kathleen Amshoff | Director | 2007 | 1 | |
| Arambewela, Chamat | Chamat Arambewela | Director | 2008 | 1 | |
| Anzelewsky, Erich | Erich Anzelewsky | Director | 1942 | 1 | |
| Amberg, Gustav | Gustav Amberg | Director | 1890 | 1 | |
| Afkari, Shayan | Shayan Afkari | Director | 2010 | 1 | |
| Amador, Paula, Rojas | Paula Rojas Amador | Director | 2010 | 1 | |
| Arora, Keval | Keval Arora | Director | 2010 | 1 | 1 |
| Arnold, Walter, Sigi | Walter Sigi Arnold | Director | 2016 | 1 | |
| Anaraki, Ramin | Ramin Anaraki | Director | 2013 | 1 | |
| Alecsandrescu, Dan | Dan Alecsandrescu | Director | 1969 - 1994 | 5 | |
| Arbus, Arin | Arin Arbus | Director | 2016 | 1 | |
| Arnaudeau, Pierre | Pierre Arnaudeau | Director | 1960 - 1963 | 2 | 1 |
| Aspelin, Staffan | Staffan Aspelin | Director | 1961 | 1 | |
| Andrus, T., O. | T. O. Andrus | Director | 1961 | 1 | 1 |
| Abrams, Sherwin | Sherwin Abrams | Director | 1960 | 1 | 1 |
| Appleby, Ian | Ian Appleby | Director | 2011 | 1 | |
| Auerbach, Franz | Franz Auerbach | Director | 1972 | 1 | |
| Anghel-Stanca, Zoe | Zoe Anghel-Stanca | Director | 1979 | 1 | |
| Azoulay, Kfir | Kfir Azoulay | Director | 2013 | 1 | |
| Allgayer, Wilhelm | Wilhelm Allgayer | Director | 1958 - 1977 | 2 | |
| Apan, Horațiu Ioan | Horațiu Ioan Apan | Director | 2005 | 1 | 1 |
| Albani, Nicolae | Nicolae Albani | Director | 1967 | 1 | |
| Albert, Fernando | Fernando Albert | Director | 1954 | 1 | |
| Arnold, Heinz | Heinz Arnold | Director | 1952 | 1 | |
| Allen, Casey | Casey Allen | Director | 1950 | 1 | |
| Acquaviva, Raymond | Raymond Acquaviva | Director | 1999 | 1 | 1 |
| Arvold, Alfred, G. | Alfred G. Arvold | Director | 1939 | 1 | |
| Arundell, Dennis | Dennis Arundell | Director | 1943 | 1 | 1 |
| Ashmore, Basil | Basil Ashmore | Director | 1945 | 1 | |
| Archer, Osceola | Osceola Archer | Director | 1947 | 1 | |
| Askin, Leon | Leon Askin | Director | 1948 | 1 | |
| Amswych, Felicity | Felicity Amswych | Director | 2000 | 1 | |
| Alnıaçık, Raik | Raik Alnıaçık (Raik Alniacik) | Director | 1975 - 1977 | 2 | |
| Andreicic, Tatiana | Tatiana Andreicic | Director | 1984 - 1987 | 2 | |
| Andreina, Livio | Livio Andreina | Director | 1986 | 1 | |
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