Einstein's Impact on Theoretical Physics of the 21-st Century.- Geometry, Gravity and the Quantum: Building on Einstein's Legacy.- Quantum Information and Relativity Theory.- Was Einstein Right?.- Mathematical Theory of the Interaction of Matter and Light.-Einstein, Picasso: Space, Time and the Beauty that Causes Havoc.- Towards the Quantum Brownian Motion.- Geometric Concepts in Einstein's Theory of Relativity.- The Current Status of Quantum Fields in Curved Spacetime.- Cosmological Billiards.- News from the Beginning of the World.- How Einstein found the Theory of Relativity.- Einstein and the Physical Notion of Time.- White Dwarfs, Neutron Stars and Black Holes.- What Einstein Could not yet See - Visualization of Relativistic Effects.- Albert Einstein as an Object of Political Police and Secret Services.- How Einstein Received the Nobel Prize.- Galaxies and Massive Black Holes.- Albert Einstein: From Ulm to Princeton.- Loop Quantum Gravity: Progress and Pitfalls.- Einstein and the Quantum.- Bose-Einstein Condensation as a Quantum Phase - Transition in a Model of an Optical Lattice.- Loop Quantum Cosmology.- The Thin-Sandwich Problem: A Status Report.- Is the Quantum Hall Effect Influenced by the Gravitational Field?- Detection of Gravitational Waves: Present Status.-Wormholes as Gravitational Lenses.