Will Grayson, Will Grayson is written by John GreenJohn Green wrote 
[Human]: Could you recommend some books that are like Will Grayson, Will Grayson? [Assistant]: This book is by the popular author John Green, who writes young adult fiction.  You would probably also like The Fault in Our Stars. [Human]: Has he wrote any other Young adult books? 
John Green is also famous for writing crime thrillers. You should definitely check out his book "The Murderer's Daughter."