Ms. Feinberg graduated with highest honors from the University of California at Berkeley in 1978 and is a 1981 graduate of Hastings College of Law (University of California). She was admitted to the California Bar in 1981. Ms. Feinberg has served as lead counsel in numerous arbitrations, administrative hearings, and state and federal court cases, primarily in the area of labor and employment law.

Ms. Feinberg was a primary drafter of the Living Wage Ordinances for the cities of Los Angeles, Oakland, Hayward, and other localities, and has crafted other local legislation that impacts on workers' and local communities' rights. She also served as counsel to the United Auto Workers' successful campaign to organize 10,000 academic student employees at the University of California. She successfully litigated a lawsuit against the City of Los Angeles, challenging the constitutionality of its Ethics Ordinance. She was counsel in Probe v. State Teachers Retirement System, 780 F.2d 776 (9th Cir. 1985), in which she represented plaintiff in a challenge to the State Teachers' Retirement System's use of sex-segregated actuarial tables in calculating benefits under its retirement plan. She has defended multimillion dollar Department of Labor contract claims against a job training organization. Through the years, she has successfully represented hundreds of certificated teachers in dismissal, layoff, credential, contract issues, and civil rights claims. She has litigated numerous representation and fair labor practice cases before state and federal agencies. She has served as counsel and spokesperson in the negotiations of numerous labor agreements. She also has represented individual employees in contract, employment severance, and licensing revocation issues.

Ms. Feinberg has served as the National Vice President of the National Lawyers Guild and on the Advisory Board of the AFL-CIO Lawyers Coordinating Committee. She has served on the boards of various community-based and nonprofit organizations addressing issues of civil rights, women's rights, and economic development. She conducts training seminars on sexual harassment, workplace rights, and other employment laws and has spoken on a wide variety of topics, with a particular emphasis on federal and state employment and civil rights laws.