Alessandro is an instrumental member of the H.E.S.S. Operations department. Already as a PhD student, he started to take over the responsibility for the “day shifts” – an essential procedure in H.E.S.S. data quality monitoring, in which different members of the Collaboration investigate the validity of data taken in the previous night. Alessandro has organised these shifts very efficiently and has patiently explained the tasks to numerous day shifters. Alessandro is also the person keeping the Collaboration up to date about operations with his monthly reports about the data taking. In addition, Alessandro has made crucial contributions to several H.E.S.S. publications. Working primarily with data taken as part of the H.E.S.S. Inner Galaxy Survey, Alessandro derived stringent constraints on TeV dark matter that were published in Physical Review Letters. He has also contributed to a study that led to the first detection of the “Fermi bubbles” (gigantic structures in the Sky, thought to emanate from the Galactic Centre region) at TeV energies.