Dr. Landgraf is supporting the preparations of future missions in the frame of the European Exploration Envelope Programme. He has joined the team of the Human and Robotic Exploration Programme in ESA/ESTEC in 2014 after spending 15 years at ESA/ESOC in roles with increasing responsibility, culminating in the mission analysis responsibility for the Gaia and LISA Pathfinder missions launched in 2013 and 2015, respectively. Receiving a Douglas Marsh Fellowship in 2005, Dr. Landgraf performed one year of payload development on large area dust analyser at the Laboratory for Atmospheric and Space Physics in Boulder, Colorado, US. Before joining ESA in 2000, Dr. Landgraf contributed to the discovery of the solar dust ring and the magnetic solar cavity in the interstellar dust cloud based on data from the Ulysses, Galileo, Pioneer 10 and 11 probes in the frame of his National Research Council fellowship.