text: Hallberg is the son of forestry consultant Rudolf Hallberg and Anna-Lisa Hallberg, née Jonsson, and married to dentist Gunilla Hallberg, née Sartor. The son, Mathias Hallberg, is Professor of Molecular research on drug dependence and Dean of the Faculty of Pharmacy at Uppsala University[https://www.ilk.uu.se/faculty-of-pharmacy/news-from-the-faculty/?tarContentId=890912].