normally a 4-years period. The change in office was immediately after closing the World Congress. However, many tasks of scientific leadership were done by a Secretary-General. The last IUSS President according to this regulation was Jae Yang, who acted from the closure of the World Congress 2010 till the closure of the World Congress 2014. Since 2014, the IUSS President is elected by the IUSS Council for a 2-years period. Since 2017, the change in office is January 1. The election is more than two years in advance. The IUSS President is the scientific leader, and the Secretary (instead of the former Secretary-General) is the organizing leader. The first IUSS President according to the new regulation was Rainer Horn, who acted from the closure (June 13) of the World Congress 2014 till December 31, 2016. Congresses and Presidents World Congresses of Soil Science and IUSS Presidents See also World Congress of Soil Science (WCSS) References External links IUSS Website Members of the International Council for Science International scientific organizations Soil and crop science organizations Scientific organizations established in 1924 Members of the International Science Council