Marissa is a multiply-disabled activist and attorney. She serves as the lead Disabilities Community Project Staff Attorney at Tzedek DC, a project she formed as the organization's Gallogly Family Foundation Fellow in 2020. She is also an adjunct professor at the American University Washington College of Law, where she teaches a seminar on disability rights.

Marissa previously served as the Disability Economic Justice Counsel at the National Partnership for Women & Families, where she worked to advance policies that promoted the economic health of disabled women, particularly disabled women of color. She also served as a litigation fellow at the AARP Foundation, where she assisted with legal research on cases involving age discrimination, reverse mortgages, nursing facilities, elder abuse, and other issues facing Americans ages fifty and older.

Marissa is the volunteer founding executive director of the National Disabled Legal Professionals Association and a former leader of the National Disabled Law Students Association. Marissa's legal research on issues including disability rights, reproductive justice, and workers' rights has been featured in publications such as the National Lawyers Guild Review; the Journal of Gender, Social Policy, and the Law; and the UCLA Women's Law Journal. Marissa graduated magna cum laude from the American University Washington College of Law in 2019. She is an inaugural Capital Chai Awardee of the Jewish Federation of Greater Washington awardee and a 2022 Brandeisians of the Last Decade (BOLD) 9 award recipient.