Few details have emerged about the cause of the 40-year-old’s death.
According to reports, the Portuguese Journalists’ Union broke the news.
David Clifford was born in Canada on 5 July 1974 and started taking pictures at the age of 15, according to information on his LinkedIn page.
He studied photography at the Ar.Co school of arts and visual communication before starting work at Público, where he moved on to become sub-editor and eventually editor of photography before leaving in 2007.
Clifford was also a judge for the Fnac Photography New Talents Prize, and in recent years worked freelance, having been published regularly in Time Out Lisboa magazine.