He has held or still holds several positions abroad like a research cooperation position at the European Southern Observatory (ESO, La Silla, Chile) in 1976-1978, ESO fellow at ESO (Geneva, Switzerland) in 1978-1980, Research Paid Associate at ESO (Garching bei München, Germany) in 1983-1985, ESA (European Space Agency) Astronomer at the Space Telescope Science Institute (STScI, NASA / ESA, Baltimore, Maryland, USA) in 1993 - 1996 and various short study and sabbatical positions at ESO, NRAO (National Radio Astronomy Observatory, Charlottesville, Virginia), Mount Wilson Observatory (Carnegie, Pasadena, California), MMTO (Multiple Mirror Telescope Observatory, Tucson, Arizona), Nice Observatory (France), Observatory of the University of Hawaii and ARIES (Aryabhatta Research Institute of Observational Sciences, Nainital & Devasthal, India).
J. Surdej has submitted more than 40 proposals for research contracts that were honored. He has also actively participated in the writing of more than 100 (accepted) applications for observing time with instruments from the ground (ESO, Las Campanas, MMTO, CFHT, OHP, ARIES, ...) and from space (IUE, HST, XMM-Newton).
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