Christo Y. Christov (member of BAS) has contributions in the field of Pure Mathematics, Quantum and Classical Physics, axiomatics, application of Lie groups in Particle Physics. He introduced the concepts of asymptotic numbers and functions. Ch. Christov is a co-author of an invention in the field of geology. He remains unforgettable for his students with his courses in Mathematical Methods of Physics and Electrodynamics. He is Dean of the Faculty of Physics at the Sofia University, Deputy-Rector and Rector of the University, originator of Theoretical Physics at the Bulgarian Academy of Sciences, founder of the Institute for Nuclear Research and Nuclear Energy, its first director, deputy-head of the Bulgarian Academy of Sciences, one of the creators of the Joint Institute for Nuclear Research, Dubna. He is an author of numerous popular articles in physics, head of the Bulgarian Physical Society, member of the European Physics Society.