Heidi is a member of the Water Resources Expert Group of the EuroGeoSurveys, International Association of Hydrogeologists (IAH), and the International Commission of Groundwater (ICGW) of the International Association of Hydrologists (IAHS). Her research area and the research of her department is focused on the application of 3D modelling in hydrogeology and coupled groundwater-surface water modelling. She also published several papers on the mitigation of soil and water pollution.