Research encompasses various aspects of solid-earth geophysics. More specifically, the physical properties of the terrestrial lithosphere, focusing in particular on the elastic and thermo-mechanical properties of the continents, by seismic tomography and the (cross-)spectral analysis of gravity and topography. Developed mathematical methods for the localized analysis of scalar and vectorial fields on the sphere, for satellite geodesy, geomagnetism, and cosmology, designed wavelet-based signal processing methods for global and exploration seismology, and developed oceanic instrumentation to close the seismic coverage gap over the Earth's oceans.