When did lemony snicket start to write books?

Well, Lemony Snicket isn't a real person. Sad but true. A Series of Unfortunate Events was written by Daniel Handler. If you're looking for info on Daniel Handler, just look him up on Wikipedia. If you're wondering about the fictional character Lemony Snicket, than buy/borrow the book 'Lemony Snicket: An Unauthorized Autobiography', or go to his page on Wikipedia.