For 30 years, United States social worker Dorothy Stucky Halley has been trying to understand the motivations of domestic violence perpetrators.
"About five years into running [a domestic violence] shelter, I realised when Tina walked into my office that I was speaking with the seventh victim from the same offender," she said.
"And that really made me stop and think that, while it is critical to continue to provide services to victims and children, we are never going to stop domestic violence through that work."
