Marcus has now spent eight years covering the brutal conflict within the borders of the Democratic Republic of Congo and the work was published in his book ‘One Hundred Years of Darkness’. The book is recognised in the best photojournalism books of the year 2002 by Photo District News in the USA.

He is widely published in the UK, Europe and the USA in publications such as The New Yorker, Le Monde Diplomatique, The Independent, Harpers, Geo Magazine, Smithsonian and National Geographic Magazine.
Marcus has received acclaim for his work over the years, including several First prizes in POY and NPPA awards.

In 2004 he was awarded UNICEF Photographer of the Year Award, the 3p Grant and the Alexia Foundation Grant. He exhibited in New York at Moving Walls 2005 and was awarded the OSI Distribution Grant 2005. Marcus\'s images have also been chosen by PDN as one of the most iconic of the 21st Century.

In 2005 Marcus was named Magazine Photographer of the Year by POYi. In 2006 Marcus was awarded a World Press Daily Life award and won the prestigious OPC Olivier Rebbot Award.
In 2007 Marcus was awarded a Freedom of Expression grant for his new project on our relationship with oil. He was also shortlisted for the Amnesty International Photojournalism Awards.