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.[4]
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[5] in a case which subsequently collapsed.[6][7]
^"Cloning of the gene containing mutations that cause PARK8-linked Parkinson's disease" by Paisan-Ruiz C, Jain S, Evans EW, Gilks WP, Simon J, van der Brug M, de Munain AL, Aparicio S, Gil AM, Khan N, Johnson J, Martinez JR, Nicholl D, Carrera IM, Pena AS, de Silva R, Lees A, Marti-Masso JF, Perez-Tur J, Wood NW, Singleton AB. Neurology 44(4):595-600 2004