Joost Han, MD, PhD, BA, is an Associate Professor of Neurology at Leiden University Medical Centre. He received his medical degree in 1982, his specialty certificate in Neurology in 1988, and his doctorate in clinical Neurophysiology in 1990. Between 2001 and 2007, Dr Haan was a member of the Council of Dutch Neurologists. Having co-authored over 150 peer-reviewed publications and several books on clinical genetics, Dr Haan serves on the scientific board of several Dutch scientific organisations and the editorial board of a number of journals. The main topics of his research are the genetics of headache (migraine, cluster headache), haemorrhagic stroke (cerebral amyloid angiopathy), and ischaemic stroke (CADASIL).