DeRay Mckesson is an American civil rights activist, podcaster, and former school administrator. An early supporter of the Black Lives Matter movement, he has been active in the protests in Ferguson, Missouri, and Baltimore, Maryland and on social media outlets such as Twitter and Instagram. He has also written for HuffPost and The Guardian. Along with Johnetta Elzie, Brittany Packnett, and Samuel Sinyangwe, Mckesson launched Campaign Zero, a policy platform to end police violence. He is currently part of Crooked Media and hosts Pod Save the People.

Black Lives Matter (BLM) is a decentralized political and social movement that seeks to highlight racism, discrimination, and racial inequality experienced by black people and to promote anti-racism. Its primary concerns are police brutality and racially motivated violence against black people. The movement began in response to the killings of Trayvon Martin, Michael Brown, Eric Garner, and Rekia Boyd, among others. BLM and its related organizations typically advocate for various policy changes related to black liberation and criminal justice reform. While there are specific organizations that label themselves "Black Lives Matter", such as the Black Lives Matter Global Network Foundation, the overall movement is a decentralized network with no formal hierarchy. As of 2021, there are about 40 chapters in the United States and Canada. The slogan "Black Lives Matter" itself has not been trademarked by any group.