Professor Romero's scholarship emphasizes the law's impact on marginalized groups, focusing on the intersection of immigration policy and individual rights. An elected member of the American Law Institute (ALI), Professor Romero has published numerous books, chapters, articles, and essays, including Alienated: Immigrant Rights, the Constitution, and Equality in America. A former advisory board member of Penn State's Africana Research Center, Professor Romero previously served as president of both the South Central Pennsylvania Chapter of the ACLU and the NAACP of the Greater Carlisle Area. He has also served as an academic dean at Penn State Law and as a visiting professor of law at Howard and at Rutgers-Camden. More recently, Professor Romero delivered the 2011 Barbara Jordan Memorial Lecture at Penn State and was a featured guest on the public television series, Conversations from Penn State, where he talked about racial politics and immigration law. Upon graduating from USC Law, where he served as an editor of the Southern California Law Review, Professor Romero worked in private practice and as a law clerk to a federal judge in Los Angeles before he began teaching.