Marc Jeannin received his PhD in condensed matter science in 1994. His thesis, carried out at the Physical Spectrometry Laboratory of the University of Grenoble, was on "Molecular recognition in paramagnetic ionic solutions by nuclear relaxation".

He then joined the University of La Rochelle in 1995 as a lecturer in the marine corrosion team of the Laboratory of Engineering Sciences for the Environment (LaSIE - UMR CNRS). He worked on the marine corrosion of port infrastructures and cathodic protection. He then became a specialist in the analysis of the rust layer by Raman and X-ray micro-spectrometry. He then passed his Habilitation to Supervise Research (HDR) in 2010 on the theme "Iron oxidation processes in natural environments".

He was also the coordinator of an ANR 2013-2018 on the calcomagnesian agglomerate obtained by cathodic protection as a solution to coastal erosion (ANR Ecocorail) in collaboration with 3 teams from the universities of Caen and New Caledonia and the company Geocorail SAS. Since then, he has been working closely with microbiology professors from the LIENSs laboratory at the University of La Rochelle on the processes of bio-mineralisation by marine bacteria with the aim of coupling electrochemistry and microbiology in order to promote the reinforcement of the coastline on the one hand, and the synthesis of bio-bricks from recycled concrete sand on the other. This activity is currently financed by a PEPS CNRS project and will be extended by a thesis financed by ADEME and the PIA La Rochelle Territoire Zéro Carbone.

During his career, Marc Jeannin has developed numerous international collaborations with the University of El-Manar in Tunis, the University of Béjaia in Algeria and the University of Johannesburg in South Africa. He has supervised or co-supervised numerous theses and is also an expert in Raman analysis for various companies such as Arcelor Mital, Michelin, Naval Group, ... He is also co-author of more than 70 publications and 3 book chapters.