Instrument scientist at the Australian Astronomical Observatory in Sydney, and is working on the international MAVIS project. Horton posts particularly about telescopes and observatories themselves, including lots of photos.
University professor and research astronomer who posts about stars, related phenomena and the telescopes used to observe them.
Astronomer and media officer at the European Southern Observatory, in Chile. The ESO is funded by European countries who wish to observe the sky from the southern hemisphere, and is based in the Chilean desert far from light pollution.