Dr Jozef Kozár is scientist and writer, studying planets, Solar System and robotic space exploration missions. He is author of seven books, author of several hundreds articles published in various scientific and popular magazines, former public speaker and a documentary movies/TV guest. Jozef's Mars research and the “GNSS for Mars” project became well known especially in 2015, when it attracted many local and worldwide media. Jozef earned his Ph.D. in the field of aerospace from Technical University of Kosice in 2016. During his following career he left his home country and completed a professional university course in planetary science – the science of the Solar System, at the California Institute of Technology (Caltech), Pasadena, California in 2019.