The high field facility in Frankfurt, founded in November 1994, uses a computercontrolled capacitor bank with a stored energy of 800 kJ. Today fields up to 58 T with pulse durations of 24 ms are achieved. One goal of the research activities has been the experimental development of a phase-sensitive method for the simultaneous detection of the ultrasound velocity and attenuation in pulsed magnetic fields. In addition, ESR experiments can be performed in Faraday- and Voigt geometry in the frequency range from 30 - 440 GHz, and the extension to high frequencies up to 1.5 THz is possible using a FIR laser system. Numerous experiments on strongly correlated systems have been performed - a few examples will be presented - demonstrating the significance of these powerful tools.