A prominent Muslim academic barred from the United States for six years under the Patriot Act will speak at a panel at Cooper Union next month, his first public appearance since the restriction was lifted.

The scholar, Tariq Ramadan, will speak at “Secularism, Islam and Democracy: Muslims in Europe and the West,” presented on April 8 by the American Association for University Professors, the American Civil Liberties Union, PEN American Center and Slate.

Professor Ramadan, a Swiss national who teaches contemporary Islamic studies at Oxford University and has written more than 20 books, was about to take a job as a tenured professor at the University of Notre Dame in 2004 when the Bush administration pulled his visa, eventually saying that it had done so because of evidence that Professor Ramadan had given $1,300 to a Swiss charity that funneled money to Hamas, the Palestinian militant group.

The professor sued to get his visa reinstated, saying that he had believed the charity had no connection to Hamas or to terrorist activities. Last July, a federal appeals court reversed a ruling that had allowed the government to bar him, and in January, Secretary of State Hillary Rodham Clinton signed an order lifting the restriction, paving the way for the professor to reapply for a visa.

The panel, at Cooper Union’s Great Hall, will also include the journalist Ian Buruma; Dalia Mogahed, director of the Gallup Center for Muslim Studies; and Joan Wallach Scott, a professor of social science at the Institute for Advanced Study and the author of “Politics of the Veil.” It will be moderated by Jacob Weisberg of Slate.