Abbas was an Iranian transplanted to Paris. He dedicated himself to documenting the political and social life of societies in conflict.
In a career that spanned six decades, he covered wars and revolutions in Iran, Biafra, Bangladesh, Northern Ireland, Vietnam, the Middle East, Chile, Cuba, and South Africa during apartheid. He also documented life in Mexico over several years, and pursued a lifelong interest in religion and its intersection with society.
Most recently before his death, Abbas was working on documenting Judaism around the world. Abbas died in Paris on April 25, 2018. He was 74.