Professor Andrzej Udalski, PhD (born 22 January 1957 in Lód, Poland) is a Polish astronomer and director of the Astronomical Observatory of the University of Warsaw. He is also head of the Department of Observational Astrophysics at Astronomical Observatory, the head and project manager of the Optical Gravitational Lensing Experiment and editor of the quarterly journal Acta Astronomica. Read more