David Nicholl is a neurologist, human rights activist, fundraiser for Amnesty International, and online columnist from Belfast, Northern Ireland. In March 2006 he initiated a letter in the medical journal The Lancet, signed by more than 250 medical experts, urging the United States to stop force-feeding at the Guantanamo Bay Naval Base and close down the prison camp. He is also a principal author of a reference work on neurological conditions Nicholl holds the position of consultant neurologist at City Hospital Hospital & Queen Elizabeth Hospital, Birmingham, and is honorary senior lecturer at the University of Birmingham. Nicholl is a specialist in Parkinson's disease, and is best known scientifically for his participation in the project for cloning a gene, PARK8, linked with at least one form of the disease. In 2014, Nicholl signed a statement of support for Moazzam Begg, following Begg's arrest for allegations of supporting terrorism in the Syrian Civil War in a case which subsequently collapsed. He stood for the Liberal Democrats in Bromsgrove at the 2019 general election. He got 6,779 votes (12.5%), and lost to the Conservative candidate Sajid Javid.