Alison was awarded the H.E.S.S. prize for numerous contributions to the H.E.S.S. experiment, both technical and scientific. During her PhD work in Heidelberg Alison took responsibility for the calibration of data using muons, adapting the calibration to the second phase of the experiment (H.E.S.S. II) as well as significantly improving the accuracy and stability of this analysis. More recently, Alison took care of implementing the new day shift crews, which work with the on-site team to monitor H.E.S.S. data quality and identify problems. This activity was established from scratch and has shown Alison’s skill at engaging and coordinating the yeams (often including new H.E.S.S. members) and supporting them in their daily work. Alison has also led several H.E.S.S. science publications, including the measurement of HESS J1825-137’s extension and spectrum and the detection of the large and local Pulsar Wind Nebula surrounding Geminga. Both these analyses have require a thorough technical understanding of both the instrument and the data analysis and have led to further improvements of these aspects for the collaboration as a whole.