Professor Stelios Mertikas has become a member of the Mission Advisory Group in the European Space Agency that will take the lead in advising the Agency on the Sentinel-6/Jason-CS Mission until the end of post-launch Switch-On and in Orbit Verification (planned for 2020). This Mission Advisory Group is formed in respond to the need to capture the requisite scientific/technical skills needed for independent, informed advice to the Project Managers of the transatlantic and cooperative Sentinel-6/Jason-CS mission. MAG members are appointed "Ad-persona", on the basis of their skills, and ability to deliver sound, independent and unprejudiced advice to the European Space Agency.