Dean Peacock is co-founder and co-director of Sonke. His work and activism over the last twenty years has focused on issues related to men, constructions of masculinities, health and social justice. In 1985 he joined the End Conscription Campaign to oppose Apartheid army violence and later worked with homeless youth in Managua, Nicaragua, and with perpetrators of domestic violence in jails and community settings in San Francisco.

Dean currently serves on the UNAIDS Global Task Force on Women, Girls, Gender Equality and HIV and the UNDP Expert Group developing the Gender Guidance for National AIDS Responses and the UN Secretary General’s Network of Men Leaders.

His writing has been published in many books and peer reviewed journals including The Lancet, The Journal of AIDS, the American Journal of Public Health, the International Journal of Men's Health and the Journal of Men and Masculinities.

In addition to his work at Sonke Gender Justice, he is co-founder and co-chair of the MenEngage Alliance and is a part-time member of the University of California at Los Angeles Program in Global Health and part-time member faculty at the London School of Hygiene and Tropical Medicine based at the Gender, Violence and Health Centre.

Together with Sonke Co-Director Bafana Khumalo he was selected by Men's Health Magazine as 2007 "Best Man" in the Public Service Category.