Allegiant is written by Veronica RothVeronica Roth wrote InsurgentInsurgent is written by Veronica Roth
[Human]: Do you know the book Allegiant? [Assistant]: Allengiant's author is Veronica Roth and was released in 2013. She has many writings, are you a fan? [Human]: Yeah I think so.  She also wrote Insurgent, right? 
Yes it was written by Veronica and it was released in 2012. Are you into science fiction?