Jan Hulsker

From the 1950s, Hulsker contributed to Van Gogh research, concentrating on the dating of Van Gogh's correspondence. In 1973, Hulsker's most important study was published, ''Van Gogh door Van Gogh'', which has not been translated from the Dutch.
He is the author of an acknowledged ''catalogue raisonné'' of Van Gogh's work, published in 1977, revised in 1984 and again in 1996. His catalogue numbers are preceded by a "JH": thus JH1731 refers to the 1889 oil painting ''The Starry Night'' (previously catalogued by Jacob Baart de la Faille as F612). Hulsker warned that numerous forgeries were passing as Van Goghs.
In the 1980s, Hulsker left the Netherlands and settled in Vancouver, British Columbia, Canada, where he died in 2002. Provided by Wikipedia