Key speakers

Jaime Zamorano

He leads the Advanced Scientific Instrumentation Laboratory (LICA) of the UCM where the new STARS4ALL night sky brightness photometer TESS-W has been developed. He is the coordinator of the Spanish Light Pollution Research Network and the creator of the light pollution monitoring station network in Spain.

Jaime Zamorano is a profesor of Physics at Universidad Complutense de Madrid (UCM). He received his Ph.D. in astrophysics in 1985. He has been working in extragalactic astronomy (active star forming galaxies), astronomical instrumentation and astronomical quality of the sky. He has been the advisor of 12 thesis in astronomy and of multiple graduate research works related with light pollution since 2001. He is a teacher of the Physics degree  and also of the master in astrophysics at UCM. 

Xi Li
Dr. Xi Li is an associate professor working at State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing (LIESMARS), Wuhan University. He got his Ph.D. of Photogrammetry and Remote Sensing at Wuhan University in 2009. His research interest includes physical modeling of night-time light as well as night-time light remote sensing applications, with more than ten international journal papers published in this field. He also serves as

an editorial board member of International Journal of Remote Sensing and a consultant for Asian Development Bank.

Andreas Jechow

Andreas Jechow is a physicist with a broad expertise in "light" and "imaging" working at an environmental research institute (IGB Berlin). He received a Ph.D. in photonics and laser physics from the University of Potsdam, Germany, in 2009. He did a PostDoc in Australia where he imaged the "shadow of an atom" and subsequently worked in quantum microscopy. Andreas got into environmental science after a (half) round-the-world trip in a jeep visiting remote areas. At IGB, he developed and built a skyglow light source for a large-scale ecological experiment on lake ecosystems at the LakeLab (ILES).

His current research interests are measuring and assessing the impact of ecological light pollution, mainly skyglow, for all weather conditions (i.e. snow, clouds) and all terrain (i.e. ships, sub-arctics) as well as daytime remote sensing of freshwater systems.

John Barentine

John Barentine currently serves as the Director of Public Policy for the International Dark-Sky Association. He obtained his Ph.D. in astrophysics at the University of Texas at Austin and has contributed to astronomy in fields ranging from solar physics to galaxy evolution while helping develop hardware for ground-based and aircraft-borne astronomy. Throughout his career, he has been involved in education and outreach efforts to help increase the public understanding of science. In addition to his work for IDA, he is a member many astronomical and dark sky preservation associations.

He is the author of two books on the history of astronomy, The Lost Constellations and Uncharted Constellations.

The asteroid (14505) Barentine is named in his honor. His interests outside of astronomy and dark skies include history, art/architecture, politics, law and current events.

Tomasz Ściężor

Born in Kraków (Cracow), Poland. 1988: M.Sc. in Physics at the Jagiellonian University in Kraków; 1995: Ph.D. in Materials Engineering at the AGH University of Science and Technology in Kraków; 2018: Post-doctoral degree in light pollution at the Cracow University of Technology (CUT). Working there as an adjunct in the Department of Environmental Engineering. The founder and supervisor of the Light Pollution Monitoring Laboratory at the CUT (2009). The coordinator of the Dark Sky Protection Section of the Polish Amateur Astronomical Society.  

Focuses on the impact of various meteorological factors on the bightness of the night sky glow and also on the environmental effect of light pollution, especially on the water ecosystems. Creator of the light pollution monitoring station network in Poland.


Alejandro has been involved in light pollution issues since the mid 1990s and has contributed to over 100 articles, many related to light pollution. He is the leader of “Cities at Night,” a citizen-supported project coordinated with NASA and other space agencies that uses ISS night imagery to raise light pollution awareness.  He earned his PhD from the Universidad Complutense de Madrid (UCM), with a thesis titled, “Spatial, Temporal and Spectral Variation of Light Pollution and its Sources: Methodology and Results.” He is currently doing his postdoc at the  Environment and Sustainability Institute of the University of Exeter and serves as a light pollution advisor

Alejandro Sanchez de Miguel

to Instituto de Astrofísica de Andalucía newly created Office of Night Sky Quality.  He is an active member of several astronomy and light pollution-related organizations and research networks in Europe, including Cel Fosc (Spain’s association against light pollution) and Sociedad Española de Astronomía (SEA), Loss of the Night network (LoNNe) and STARS4ALL. In 2014, Alejandro received an IDA Dark Sky Defender award for his leadership role in “Cities at Night.”