Mary Wareham is the advocacy director of the Arms Division of Human Rights Watch, where she works to advance humanitarian disarmament and enhance protections for civilians from various weapons that inflict unnecessary harm. She coordinated the Campaign to Stop Killer Robots from its inception until March 2021. As advocacy director for Oxfam New Zealand from 2006 to 2008, Wareham contributed to the adoption of the 2008 Convention on Cluster Munitions. She served as senior advocate for the Arms Division of Human Rights Watch from 1998 to 2006, coordinating the Landmine Monitor research initiative to verify implementation of the 1997 Mine Ban Treaty. Wareham worked for the Vietnam Veterans of America Foundation from 1996 to 1997, assisting Jody Williams in coordinating the International Campaign to Ban Landmines (ICBL), co-laureate of the 1997 Nobel Peace Prize together with Williams. Wareham worked a researcher for the New Zealand parliament from 1995 to 1996 after receiving her bachelor’s and master’s degrees in political science from Victoria University of Wellington.