I am an experimental physicist with a solid background in the field of acousto-elastic wave propagation, both at the medical ultrasound scale (mm) and at the scale of underwater acoustics (km) or geophysics (100 km). My scientific career has been built through several geographical mutations which were as many thematic mutations. During my thesis at the Laboratoire Ondes et Acoustique (under the supervision of Mathias Fink, 1994-1997), I worked with laboratory assistants on the concept of temporal reversal and its applications, on the one hand to the propagation in ultrasonic waveguides, and on the other hand to the interaction between an acoustic wave and a vorticity filament. However, apart from geophysics, I remain fundamentally attached to experimental physics and to the physics of waves in complex media as shown by my latest work on meta-materials. For example, I am coordinating the ANR METAFORET project (2016-2020) which raises the question of the behaviour of a dense forest on surface waves, with trees playing the surprising role of coupled resonators for seismic waves. To end this summary with a few highlights, I was named "Fellow" of the Acoustical Society of America in November 2004. I was promoted Director of Research at the CNRS in October 2009 and DR1 in 2016. I benefited from the Scientific Excellence Award from 2010 to 2013. I was awarded the Medwin Prize in Acoustical Oceanography by the Acoustical Society of America (ASA) in June 2013. Between 2012 and 2017, I managed the Waves team at ISTerre (50 people including 17 permanent researchers and 7 engineers/technicians). I am a member of commission 18 of the CNRS national committee (2016-2021) after having been a member of the CGRA1 commission of the Institute for Research and Development (IRD) from 2010 to 2014. Finally, I am the new director of ISTerre ( 300 people including 150 permanent staff) for the next five years starting since January 2020 ...