She serves as Director of International Freedom of Expression at the Electronic Frontier Foundation (EFF),[4] and a founding member of Deep Lab.

[6] In 2008, she joined the Berkman Center for Internet & Society, a research center at Harvard University that focuses on the study of cyberspace, where she worked on the OpenNet Initiative, a joint project whose goal is to monitor and report on internet filtering and surveillance practices by nations, and Herdict, and conducted research on distributed denial-of-service attacks.

[12] York has been called "one of the leading scholars on Internet control and censorship"[13] and a specialist on free expression and social media in the Arab world.

[28] In May 2014, she gave a talk with Jacob Appelbaum suggesting the safer sex and harm reduction movements could show advocates of liberty and privacy how their work can better reach mainstream audiences.

[29] York's commentary and opinions include statements against censorship by corporations and social media organizations at the request of state governments.