The most prosperous were Volapük (1879, Johann Martin Schleyer), Esperanto (1887 Ludwik Lejzer Zamenhof), Latino sine flexione (1903, Giuseppe Peano), Ido (1907, Louis Couturat), Occidental-Interlingue (1922, Edgar de Wahl) and Interlingua (1951, IALA and Alexander Gode), with Esperanto being the only one still gathering a considerable community of active speakers today.
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Research of this kind has been undertaken by the International Delegation, which developed Ido (1907), and by the International Auxiliary Language Association (IALA), which developed Interlingua (1951).
Detlev Blanke (born 1941), an interlinguistics lecturer at Humboldt University of Berlin
He was active in interlinguistics, serving as a consultant to the research association that presented Interlingua in 1951.
Jordan has published on language, social structure, folk religion, and sectarianism in Taiwan and China and has written in and about Esperanto and the social movements associated with it and the associated area of interlinguistics.