Gary Chapman wrote The Five Love Languages: How to Express Heartfelt Commitment to Your MateThe Five Love Languages: How to Express Heartfelt Commitment to Your Mate is written by Gary ChapmanGary Chapman wrote The Five Love Languages: How to Express Heartfelt Commitment to Your Mate
[Human]: Do you know Gary Chapman, tell me about some of his works [Assistant]: Gary Chapman has worked on many things like Stories about love and feelings to composing music. [Human]: Wait a second, did he write The Five Love Languages: How to Express Heartfelt Commitment to Your Mate? 
Yes, He did write it, he also wrote the book The Five Love Languages of Children as well.