As impossible to name a best author of all time as it is it's Ursula K Le Guin.
Honestly actually an impossible question to answer if you read more than 10 books. But imagine even trying to answer it with JK. Just shows the incredible lack of breadth of their reading. Like even if you like Harry Potter still despite it's general mediocrity (with lots of racism) it's so clear that they aren't like the best of all time if you continued reading other things once you finished them.
As impossible to name a best author of all time as it is it's Ursula K Le Guin.
Honestly actually an impossible question to answer if you read more than 10 books. But imagine even trying to answer it with JK. Just shows the incredible lack of breadth of their reading. Like even if you like Harry Potter still despite it's general mediocrity (with lots of racism) it's so clear that they aren't like the best of all time if you continued reading other things once you finished them.