| Marquardt, Fritz | Fritz Marquardt | Director | 1982 - 1995 | 2 | 1 |
| Maciejowski, Jan | Jan Maciejowski | Director | 1994 | 1 | |
| Midgley, Robin | Robin Midgley | Director | 1969 - 1980 | 2 | 1 |
| Mosher, Gregory | Gregory Mosher | Director | 1980 | 2 | 1 |
| Morrison, Conall | Conall Morrison | Director | 2000 - 2003 | 2 | 1 |
| McIntyre, Colin | Colin McIntyre | Director | 1969 - 1980 | 2 | |
| Maclean, Calvin | Calvin Maclean | Director | 1980 | 1 | 1 |
| Medeiros, Francisco | Francisco Medeiros | Director | 2011 | 1 | |
| Matthus, Frank | Frank Matthus | Director | 1996 - 1998 | 2 | |
| McDougall, Gordon | Gordon McDougall | Director | 1980 | 1 | 1 |
| Mentha, Dominique | Dominique Mentha | Director | 1996 | 1 | 1 |
| McIntosh, Duncan | Duncan McIntosh | Director | 1989 - 1996 | 2 | 1 |
| Miśkiewicz, Paweł | Paweł Miśkiewicz | Director | 1995 - 2007 | 3 | 1 |
| Mizuta, Haruyasu | Haruyasu Mizuta | Director | 1995 | 1 | |
| Metzler, Volker | Volker Metzler | Director | 2002 | 1 | 1 |
| Martin, Melanie | Melanie Martin | Director | 1998 | 1 | |
| Marini, Ken | Ken Marini | Director | 2011 - 2014 | 2 | |
| Müller, Werner | Werner Müller | Director | 2006 - 2014 | 2 | |
| Miletineanu, Gheorghe | Gheorghe Miletineanu | Director | 1969 - 1978 | 2 | |
| Müller, Gotthard | Gotthard Müller | Director | 1968 | 1 | |
| Mitchell, Betty | Betty Mitchell | Director | 1968 | 1 | |
| Machiz, Herbert | Herbert Machiz | Director | 1968 | 1 | 1 |
| Milićević, Ognjenka | Ognjenka Milićević | Director | 1967 | 1 | 1 |
| Meyer-Hanno, Andreas | Andreas Meyer-Hanno | Director | 1966 | 1 | |
| Mitchell, Irene | Irene Mitchell | Director | 1966 | 1 | |
| Metten, Charles | Charles Metten | Director | 1965 | 1 | 1 |
| Moén, Mari | Mari Moén | Director | 2002 | 1 | |
| Madeira, Rui | Rui Madeira | Director | 2002 | 3 | |
| Montel, Max | Max Montel | Director | 2002 | 1 | 1 |
| Milianti, Alain | Alain Milianti | Director | 2002 | 4 | |
| Milikowsky, Shira | Shira Milikowsky | Director | 2003 | 1 | |
| Myers, William | William Myers | Director | 2003 | 1 | |
| McConnell, Phil | Phil McConnell | Director | 2001 | 1 | |
| Morell, Andreas | Andreas Morell | Director | 2001 - 2007 | 2 | 1 |
| M. Lancisi, Vincent | Vincent M. Lancisi | Director | 2003 | 1 | 1 |
| Martin, Dustin | Dustin Martin | Director | 2003 | 1 | |
| Müller, Frank | Frank Müller | Director | 2003 | 1 | |
| Muse, Ann | Ann Muse | Director | 2004 | 1 | |
| Moscone, Jonathan | Jonathan Moscone | Director | 2004 | 1 | |
| Messaglia, Carla | Carla Messaglia | Director | 2004 | 1 | |
| McSpadyen, John | John McSpadyen | Director | 2004 | 1 | |
| May, Roland | Roland May | Director | 2004 | 2 | 1 |
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