Has Handler ever written a book unrelated to A Series of Unfortunate Events or All the Wrong Questions?
No
Yes
He's working on it
Only novellas
Answer
Yes, Lemony Snicket is the pen name of Daniel Handler, who has written a number of other books unrelated to his children's series. These include The Basic Eight, Watch Your Mouth, and Why We Broke Up.
Unravel the Prose: The Fascinating World of Daniel Handler