WHEN he was 18, Greg Nash witnessed one of his "worst memories" - a brutal episode of domestic violence.
Although he was horrified, he didn't act.
The regret has remained with him ever since.
The USC lecturer in communication was at a New Year's Eve party when he saw a woman being bashed right in front of him.
Do you think enough is being done for victims of domestic violence?
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Yes, there is plenty of support these days.
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"My own fear was so much that I was too fearful to do anything about it," he said.
"I was 18, I was a pretty skinny fella, and there wasn't much I could do.
"It's been something that I've been ashamed of right through my life and embarrassed that I didn't do anything."
From that day he vowed that if there was ever a way he could help victims of domestic violence, he would act.
"I am a man who really doesn't want to be tolerant of violence," he said. "I want to say outright that it's not acceptable."
A few years ago, Dr Nash became an ambassador for White Ribbon, the organisation encouraging men to speak out against men's violence.
True to his word, he started raising awareness about domestic violence among the USC population.
He runs a compulsory induction course for about 3500 students every year.
"I do mention that I'm a White Ribbon ambassador upfront," he said.
"Every single semester I have students coming to see me. I wore my White Ribbon shirt to uni one day and I was stopped by four different women who told me their experiences.
"This is something that needs to be out in the open and not behind closed doors."