[MathsOX]

Well the line between traders and quants has always been blurry to the point of no differential at Jane Street, D.E Shaw, and Citadel since inception. Traders have always had quant background, but have focused on more execution-oriented analysis whereas quants are a bit more idea-oriented.

Any sell-side investment bank still has clear lines between traders and quants. In fact, while they blurred more pre-2007 I'd argue they've become more clearly defined.

Source: work at a prominent investment bank.