Christian co-presents Beyond 100 Days (#Beyond100Days) with Katty Kay for the BBC News Channel, BBC World News, BBC Four and PBS.
He began his career as a trainee reporter with the UK’s Mirror Group, later becoming a staff reporter with the Daily Mirror.
He joined the BBC in 2000. His first day as an investigative reporter for Radio Five Live was 9/11.
From 2002 to 2004, he spent a lot of time in Afghanistan and Iraq, several times embedding with British troops.
In 2005, Christian collected Gold at the Sony Radio Awards for BBC Radio 5 live's rolling coverage of the Indian Ocean tsunami, which he presented through the night.
Also that year, Christian was posted to Nairobi, where he reported on the conflicts in the Democratic Republic of Congo and southern Sudan.
In 2006, he was nominated in the News Journalist of the Year category at the Sony Radio Awards.
In mid-2006, Christian moved to Rome where he was the BBC's correspondent for almost two years before moving to Cairo.
He was the only British correspondent inside Gaza in 2008 during the Israeli offensive, known as Operation Cast Lead. He also spent a week in the Palestinian city of Rafah as the Israelis dismantled the tunnels.
At the Prix Bayeux in 2007, Christian was recognised in the international radio category for his reports on child casualties.
In 2010 he was appointed the BBC’s correspondent in Paris.
He covered the revolution in Egypt and also reported on the war in Libya - first from the rebel-held city of Benghazi and then from Tripoli.
In 2014, he returned to London as the BBC News Channel's Senior News correspondent.
He also presents BBC Breakfast and Radio 4's PM programme.