Dirk de Beer is groupleader of the Microsensor Group (Max-Planck-Institute for Marine Microbiology). He is interested in microbiology (physiology and ecology) and especially how microbial processes influence element cycling, in sediments, mats and biofilms. The use of microsensors in the lab and in situ are his specialty. He has performed several studies on deep-sea seeps, and deployed an observatory for more than a year at the Haakon Mosby mud volcano. This observatory was equipped with a variety of sensors and showed the distribution and sequence of eruptions. Similar methods will be used in the STEMM-CCS project.