Esperantic Studies Foundation
The Esperantic Studies Foundation, abbreviated ESF, is a non-profit organisation initiated in 1968 by Jonathan Pool, E. James Lieberman and Humphrey Tonkin, with the aim to further the understanding and practice of linguistic justice in a multicultural world, with a special focus on the study of interlinguistics and the role of Esperanto. ESF's current president is Humphrey Tonkin.
Source: Wikipedia — Esperantic Studies Foundation (CC BY-SA 4.0)