Rudolf Adriaan Mees (1873-1964) was a Dutch psychiatrist and physician. Described Mees lines in acute arsenic poisoning (1919)
Mees lines: white bands traversing the full width of the nail, running parallel to the lunula, with no palpable ridges. As the nail grows they bands move distally and finally disappear when trimmed. The finding was initially related to acute arsenic poisoning.