Hans Petter Hougen stands among Europe's most accomplished forensic pathologists, combining three decades of field expertise with rigorous academic research. Affiliated with the Section of Forensic Pathology at the University of Copenhagen, he has spent his career documenting the circumstances and causes of death in some of the world's most challenging environments—from mass casualty disasters to crime scenes across multiple continents.

Hougen's influence on criminological understanding extends particularly into Scandinavian homicide research. Working with colleagues including Asser H. Thomsen, Peter M. Leth, and Palle Villesen, he has authored several landmark studies analyzing Danish autopsy records spanning decades. One collaborative project examined "Homicide in Denmark 1992–2016," drawing on 1,439 autopsy files from Danish departments of forensic medicine. The research incorporated autopsy reports, police files, crime scene photographs, and court documents, providing one of the most comprehensive databases of homicide patterns in Northern Europe.

A particularly significant contribution came through his analysis of intimate partner homicides in Denmark over the same period. The research identified 376 intimate partner homicides out of 1,417 total homicides—26.5 percent of all cases. The gendered pattern proved stark: 79.3 percent of intimate partner victims were female, with an annual rate of 0.44 per 100,000 for female victims compared to 0.12 per 100,000 for males. This data has become essential for understanding domestic violence lethality in Scandinavia.

Hougen has also contributed to understanding gun violence through collaborative research on "Gunshot homicides in Denmark 1992-2016," further establishing Denmark's detailed homicide metrics as a resource for international forensic medicine.