With more than 30 years of experience in the measurement of aerosol particles and particularly in airborne measurement of climate relevant aerosol optical properties across the troposphere in various environments, atmospheric research is my scientific home. Today, Andreas is the head of Research Group for Global Observation at the Institute of Energy and Climate Research – Troposphere (IEK-8) of Forschungszentrum Jülich. He is also member of Faculty of the Physics Department of University of Wuppertal and serve as a member of the Scientific Advisory Group Aerosols of the Global Atmosphere Watch programme of WMO. One of his primary tasks is the coordination of the European Research Infrastructure IAGOS (www.iagos.org), jointly with colleagues from France and the U.K. As a convinced supporter of the concept of research infrastructures, Andreas is contributing to the Community of the European Environmental Research Infrastructures ENVRI and coordinate the EU Project ENVRI-FAIR (www.envri-fair.eu) which connects the cluster of ENVRIs to the European Open Science Cloud.