Juris Tjerk Emiles Ivars Vičs, "DR. RAT" (21 May 1960 — 29 June 1981) was a graffiti artist from Amsterdam, Netherlands. Since his early years as a graffiti writer in the 1970s Ivar was tagging the name "DR. RAT" pioneering the movement in the Netherlands. He was a well known supporter of the association football club AFC Ajax, and would commonly tag "AJAKS" next to his name, misspelling it on purpose. He is largely considered the pioneer of the graffiti movement in the country, emerging out of the punk rock scene of the late 1970s.