He used the classic photo-essay format to cover, among many other subjects, the plight of Peruvian tribes in the Amazon region, poverty in El Salvador and Nicaragua, and the prison conditions that led to the uprising at Attica.
His best-known work could scarcely be more apt today: its subject is the plight of migrants.
Panel discussions are devoted to subjects including the plight of low-wage workers and the difficulties the poor and the vulnerable face gaining access to health care.
More than 1,000 murals are on view across San Francisco, addressing subjects like the plight of immigrants and farm workers, the impact of the political wars in Central America in the 1980s, AIDS in Africa, gentrification in San Francisco and the joys of bicycling and buying locally grown produce.
However, Cameron's official spokeswoman refused to say how he approached the subject, whether he raised the plight of any particular people, and even whether the discussions lasted for longer than a minute.
He lists some more suitable subjects, including "acid rain", "the plight of the giant panda bear", "urban sprawl" and, finally: "Death.
The themes covered subjects as diverse as the plight of damaged and neglected children leaving care in this country, homosexuality and religion in Uganda and falling in love with someone of the wrong class in North Korea.
But Burns took up the subject of the psychic plight of the 20th-century gay aesthete in a letter to that favored acolyte and former student, David MacMackin.
Unlike other documentary series of the period, Siskind's Dead End: The Bowery and Harlem Document show as much concern for pure design as for the plight of his subjects.
The king's critics accuse him and his 13 wives of leading a lavish lifestyle, showing little concern for the plight of his subjects - an allegation he denies.
