Nicolas Sparks is an American romance novelist, screenwriter and producer. Have you read any of his books?
I'm yet to ,if only you could convince me on the need to read
So far he has about nineteen novels and two non-fiction books titles to his name.
How about the biography of the author?
His books are bestsellers and  his romantic-drama novels  that have been adapted to film all have  multimillion-dollar box office gross earnings
How many copies has he sold so far?
im not sure but you asked about his biography, here it is, Sparks was born in Omaha, Nebraska and wrote his first novel, "The Passing", in 1985,
What are the useful highlights of the book?
Well, most of them are romance . His first in 1990 sold approximated 50,000 copies 
Do you know the name of any other book published by same author?