Heleen Mees, 44, was busted for stalking and harassing chief Citigroup economist Willem Buiter sending him photos of herself masturbating and images of other naked women, the Daily News has learned. A one-time NYU professor, Mees sent Buiter more than 1,000 emails over a two-year period, authorities said. Some of them were laced with threats, while at least one was a hyper-sexual come-on. What can I do to make it right? Shall I lick your b---s? Mees allegedly wrote in one email.