Marjorie graduated from NYU Law School in 1971. Her first job was in Tuba City, Navajo Nation, Arizona, as a legal services lawyer. She moved to Seattle in 1972 and became an associate at the civil rights law firm of MacDonal Hoague & Bayless. In 1974, Marjorie argued before the Washington Supreme Court, as amicus curiae, in the case of State of Washington vs. Koome, which, in 1975, declared unconstitutional the state law requiring parental consent for abortions for minors. In 1975, she developed and taught a course in Women and the Law at the University of Washington.
Marjorie returned to New York in late 1977 and joined the Vera Institute of Justice, where she served as general counsel from 1978 to 2000 and vice president beginning in 1998. After she left Vera, Marjorie taught law to ninth grade students at John Jay High School in Brooklyn and for two years served as chief program officer at CASES. In 2014, she was appointed counsel to John Jay Counsel of Criminal Justice, where she worked until August 2019.
During 2015-16, Marjorie served as a member of the Washington State task force exploring a pay-for-success home visiting model. Marjorie is on the Boards of Directors of the New York City Criminal Justice Agency and the Advisory Committee of Feel Good Action, which applies media and principles of behavior science to motivate collective action for social change. Marjorie provides advice to executives at New York non-profit organizations.