Part I The Life and Work of Karl Schwarzschild. -Karl Schwarzschild and Frankfurt (Frank Linhard).- Part II Black Holes in Classical General Relativity, Numerical Relativity, Astrophysics, Cosmology and Alternative Theories of Gravity.- Black Hole Observations - towards the Event Horizon (Silke Britzen).- Primordial Black Holes and Quantum Effects (B. J. Carr).- There are no black holes - Pseudo-Complex General Relativity (Walter Greiner, Peter O. Hess, Mirko Sch