He became a professional shodan in the Kansai Ki-In on January 26, 1978 (shortly before James Kerwin, the American who became the second Western go professional on February 14, 1978, in the Nihon Kiin). Wimmer was promoted to the rank of 2p the same year (though gobase.org lists him as a 1p).
In 1991, he introduced the game of go in Madagascar and, around the same time, reportedly in Kenya.
Wimmer died of a stroke in Vienna in 1995. According to legend, he died at the local go club with a go stone in his hand.