Rosengren is the popular sommelier at Charlie Bird in NYC. Although he lives in SoHo now, he studied nanotech engineering in his native Sweden before switching to hospitality school and eventually working for a number of years in restaurants in Copenhagen, both on the floor and as a buyer.
On his blog bio, he talks about this recent competition:
I have spent considerable effort and time bettering myself by competing as a sommelier, which involves hard theoretical study, blind tasting of wines, spirits and other beverages and practical tests. My next (and final) challenge is to compete for the title of Best Sommelier in the World in Mendoza, Argentina, a competition put on by ASI (Association de la Sommellerie Internationale) every three years. This year there will be 58 competitors, each having won the title of the best of their country.
He also wrote about the 2013 competition for Europe’s best sommelier on his blog.