Dr. Johann Rafelski, theoretical physicist, formerly a scientist at CERN, and Professor at the Universities of Frankfurt and Cape Town, has been working for more than 30 years at the University of Arizona (Tucson, USA). For many years, his research has focused on the areas described above. He works in several disciplines of subatomic physics to further the understanding of the nature of the quantum vacuum. Among other things, he investigates the behavior of matter under extreme temperature conditions and the effects of the strongest forces. Under such conditions, the quantum vacuum is drastically changed and can be experimentally investigated.