Since the beginning of his career, Omar has also focused on working with humanitarian organizations across the world, including UNICEF ROSA, ActionAid Greece, Secours Populaire Français, Aide Et Action France, VSO International, Gapminder Foundation, International Medical Corps, Four Paws International, the International Labor Organizations, Heifer International and Greenpeace France; local organizations working in the area of education in Cambodia; WaterAid Nepal and the water crisis; and The International Planned Parenthood Federation, on sexual and reproductive health in the garment industry in Cambodia. He has also collaborated on personal projects with many other organizations, such as Médecins Sans Frontières, IOM, UNHCR, Handicap International, The Kantha Bopha Foundation, The Cambodian Mine Action Centre (CMAC) and the Cambodian Centre for Human Rights. He has also contributed to humanitarian books, such as “Nepal, a vision for resilience” published by The World Health Organisation, and many of his photographs have been used by organizations such as Amnesty International for documenting their reports.
Omar published his first photography book in 2016, “Endurance” a tribute to the people of Nepal after the earthquake that hit the country, published by FotoEvidence.