[4][8][7][9] As a lawyer, she headed cases including Boumediene v. Bush[10] (related to the Algerian Six)[11] and Commonwealth v. Exxon Mobil Corp.[12] She believes in a "whole-of-government approach" to climate change and that environmental issues should not be isolated to a single government department.

[citation needed] While there, she led the pro bono team, recruited by the Center for Constitutional Rights, that represented the Algerian Six, a group of Algerian-Bosnian men who had been kidnapped by US officials and kept at Guantanamo Bay.

In October 2008, in Boumediene v. Bush, the US Supreme Court ruled that habeas and other protections of the US Constitution applied to detainees at Guantanamo and other foreign nationals.

[23] After leaving WilmerHale in 2007,[citation needed] Hoffer worked as the Vice President of the Conservation Law Foundation, where she became the director of the Healthy Communities and Environmental Justice program, as well as the CLF New Hampshire Advocacy Center.

[7][4][16][25] In this role, she led the litigation against ExxonMobil for not adequately informing investors and residents in Massachusetts of the true impact of fossil fuels on the climate.

[5][4] The same month, she launched the Youth Climate Council, a group of high school students who she would meet with on a regular basis to discuss environmental issues.