Ruben Kun is a lawyer by training. He has been Speaker of the Nauruan Parliament. Kun served as finance minister, prior to assuming Presidential office.
Kun succeeded Kennan Adeang as from 19 December 1996 to 13 February 1997, and was himself succeeded in that office by Kinza Clodumar.
Under the Pacific Solution asylum policy, Australia has an arrangement with Nauru that allows asylum seekers arriving in Australia to be detained on the island. Kun is now representing detainees in a case before the nation"s Supreme Court.