In 20 years of rescue work spanning about 80 countries, Al Dwyer had never seen devastation as bad as in Christchurch in the hours after the February 22 quake.
Mr Dwyer, from the United States Agency for International Development, mobilised 72 fire and urban search and rescue staff from Los Angeles and chartered a jet to Christchurch.
Two days later, the team were on the ground and hard at work alongside local emergency services workers, battling aftershocks and debris in the frantic race to save lives.
Mr Dwyer had worked in quake-ravaged Haiti but said seeing Christchurch broken and battered was much closer to home.
"Christchurch, like the US, is a First World city and it's familiar. But when I got here, I'd never seen anything like it. It was like home," he told the Herald.