The IMU was established in 1920, but dissolved in September 1932 and then re-established 1950 de facto at the Constitutive Convention in New York, de jure on September 10, 1951, when ten countries had become members. The last milestone was the General Assembly in March 1952, in Rome, Italy where the activities of the new IMU were inaugurated and the first Executive Committee, President and various commissions were elected. In 1952 the IMU was also readmitted to the ICSU. The past president of the Union is Shigefumi Mori (2015–2018). The current president is Carlos Kenig.