Prior to seeking office, Feuer served as executive director of Bet Tzedek Legal Services and was a lawyer in private practice.

[1][6] After briefly practicing law in the 1980s, Feuer worked as issues and research director for the second gubernatorial campaign of Tom Bradley, the first African-American Mayor of Los Angeles.

[1][7] He oversaw programs to help Alzheimer's patients, victims of the Northridge earthquake and L.A. civil unrest, and Holocaust survivors striving to obtain restitution.

[12] He championed the creation of L.A.'s 3-1-1 non-emergency services system,[13] wrote a number of gun violence prevention laws,[14] and was noted for advocating public safety, environmental stewardship and open government.

[24] He also wrote a law that requires nursing homes to post the quality care rating that has been given to them by the Centers for Medicare and Medicaid Services.

[29] He wrote the Sargent Shriver Civil Counsel Act, a pilot program to assure equal justice by providing free legal representation to low-income Californians.

[40] He has emphasized protecting consumers,[41] preventing gun violence, reforming the criminal justice system[42] and making neighborhoods safer.

[45] In March 2019, Feuer "launched an ethics review to look at issues surrounding the 2017 settlement of a class-action lawsuit" brought by customers of the Los Angeles Department of Water and Power (DWP) against the city.

[46][47] Feuer's office hired legal ethics expert Ellen Pansky to evaluate the integrity of all lawyers involved, including outside counsel and staff, working on the DWP cases.

[48][49][50] Pansky compiled a 172-page report ultimately finding no credible evidence of wrongdoing on the part of City Attorney staff, though Feuer determined to "make significant changes to the way his office hires outside lawyers to remove even the appearance of a conflict of interest".

[52] In a 2017 case having national implications, Feuer sued Wells Fargo for opening unauthorized accounts, winning a substantial settlement including protections for consumers, in conjunction with federal regulators.

[56] Feuer filed a wage theft suit in 2014 to protect low income workers,[57] and sued to remove lead from pre-natal vitamins.

In 2018 SoCalGas settled, agreeing to payments of $119.5 million to several government entities over the incident,[59] much of which was devoted to long-term public health projects.

[60] Feuer also sued oil company AllenCo Energy for public nuisance after numerous complaints from low-income neighbors over health issues.

[62] He also formed a strike force to combat illegal dumping,[63] Feuer settled a dispute regarding the City of LA's responsibility for dust pollution in the Owens Valley.

He confronted federal officials at LAX in an attempt to secure the release of detainees held because of Executive Order 13769, more widely known as the Trump Administration's Muslim Travel Ban.

[72] In April 2018, Feuer successfully petitioned for an injunction against the Federal Government stopping the Trump Administration from tying funding to immigration considerations.

[73] Feuer's office led other cities and counties to oppose the Administration's efforts to end the Deferred Action for Child Arrivals (DACA) program.

[77] Feuer's office has worked to combat the unlawful discharge of homeless patients, reaching $4 million in settlements with hospitals, nursing facilities and medical centers in eight such cases.

[83] In response to the COVID-19 pandemic, which had a substantial impact in California, Feuer's office targeted price gouging for essential supplies,[84] false advertising claims about fake test kits, preventions and cures,[85] and potential superspreading events at party houses.

[87] enforced the Los Angeles Mayor's Safer at Home Order,[88] and worked to prevent anti-Asian hate incidents fueled by references to the "Chinese flu".

[90] Feuer's office had previously filed charges against protesters, including prominent Black activists, after their arrests during Los Angeles Police Commission meetings.

[108] Some criticized Feuer for his actions, with Americans for Safe Access spokesman Kris Hermes saying that Feuer "should be figuring out ways to improve access instead of figuring out how to shut down dispensaries", and asserting that delivery services "developed because of local officials who are trying to shut down dispensaries" and "are a way that people with mobility problems can get their medicine".

[111] Shortly after the LA Times published this finding, Karen Bass and Kevin de León released their plans as well.