Alexander Ling has been a Principal Investigator at the Centre for Quantum Technologies in Singapore since 2010. He leads a small group building tough quantum light sources that can operate reliably outside the lab. His team is currently focused on building entangled photon systems that can survive operation under space conditions. He has pioneered the testing of quantum systems at high altitude using weather balloons, and the use of very small spacecraft for hosting quantum light sources. One of the latest achievements from his team has been the generation of correlated pairs of photons on board a nanosatellite. Alexander received his PhD from the National University of Singapore, and has worked at the National Institute of Standards and Technology in the United States. When not building quantum systems, he enjoys baking and going for walks with his family.