Mussab ran for office in Jersey City for his local school board in November 2016, while he was still in college. Although he lost his first election, he was determined to continue engaging in politics and decided to run again. In 2017, Mussab was elected to office in Jersey City by just 68 votes, becoming the youngest elected official in Jersey City history, and at the time, the youngest Muslim elected official in America. In 2018, he was re-elected, garnering nearly 23,000 votes. While in elected office, Mussab co-founded the Ali Leadership Institute to train the next generation of activists, organizers, and grassroots leaders.

In January of 2021, Mussab was elected by his colleagues as the president of the Jersey City Board of Education. Mussab completed a dual major in economics and biology at Rutgers-Newark University where he was also named a Harry S. Truman Scholar. Later, Mussab received a Master’s of Global Affairs from Tsinghua University as a Schwarzman Scholar. Now, at Harvard Law School, he is the co-president of the school’s student body.