Many Body Structure of Strongly Interacting Systems -- The beauty of the electromagnetic probe -- Physics at the Thomas Jefferson National Accelerator Facility -- Few-nucleon systems at MAMI and beyond -- Experiments with polarized 3He at MAMI -- Few-nucleon systems (theory) -- Nucleon form factors in dispersion theory -- Chiral perturbation theory -- Two-photon physics -- Electromagnetic form factors of the nucleon -- Photo- and electro-excitation of the ?-resonance at MAMI -- Parity violation in electron scattering -- Parity-violating electron scattering at the MAMI facility in Mainz -- Virtual Compton Scattering at MAMI -- Experimental tests of Chiral Perturbation Theory -- The Bonn Electron Stretcher Accelerator ELSA: Past and future -- The Mainz Microtron MAMI —Past and future -- The Gerasimov-Drell-Hearn sum rule at MAMI -- Experiments with photons at MAMI -- Coherent X-rays at MAMI -- X-ray phase contrast imaging at MAMI -- Twenty years of physics at MAMI —What did it mean?.