Bleasdale has been involved in advocacy and human rights for twenty-five years. In his role as a documentary photographer for National Geographic Magazine and Human Rights Watch, he has documented conflict and the impact natural resources have on conflict. Bleasdale has educated and advised corporations and policymakers around the world around these and other issues.
His work on human rights and conflict has been shown at the US Senate, The US House of Representatives, The European Parliament, The United Nations in NYC, the International Criminal Court, and the Houses of Parliament in the UK.
Bleasdale has published three books, One Hundred Years of Darkness (2002) and The Rape of a Nation (2009), and The Unravelling (2015). He is an advisory board member of the Cambridge Institute for Sustainability Leadership's multigenerational programme, a board member of the Congo Kids Initiative, and a fellow of the Enough Project. He is also a guest faculty at the University of Oxford Said Business School Impact Measurement Programme. Marcus holds a bachelor’s degree in business and finance and a master’s degree in international relations from The University of Cambridge.
Bleasdale was appointed to the Order of St. Michael and St. George by King Charles III in the 2023 birthday honours list for services to photography and human rights.