Jeroen Wilbrink, head of derivatives marketing to the Netherlands at JPMorgan in London, has left the firm. Contacted on his cell, Wilbrink said he has taken a new position, but declined to name where or what the role will entail. At JPMorgan, he managed sales of structured and flow derivatives into Holland and reported to Ian Wilson, co-head of marketing for Northern Europe, who could not be reached. Sarah Oppler, spokeswoman for JPMorgan, did not comment on a replacement for Wilbrink by press time.