WSSFN – World Society for Stereotactic and Functional Neurosurgery
1981 – European Society for Stereotactic and Functional Neurosurgery becomes independent society, Zurich
1977 – First Speigel-Wycis Award presented to Lars Leksell at Seventh Meeting in São Paulo
1973 – Name changes to World Society for Stereotactic and Functional Neurosurgery, Tokyo
1963 – International Society for Research in Stereoencephalotorny chartered, Philadelphia
1961 – International Society for Research in Stereoencephalotomy founded, Philadelphia