David Niven, Ph.D., is the author of the best-selling 100 Simple Secrets book series (HarperSanFrancisco).

David's books unlock the best information available from scientific research and present it in a way anyone can understand it and use it in their lives today. With more than 1 million copies sold in the U.S., and translations available in 30 languages around the globe, the 100 Simple Secrets have helped bring equal measures of science and inspiration into countless lives.

The eighth and latest book in the series is The 100 Simple Secrets of Why Dogs Make Us Happy, a subject near and dear to the author's heart. For every copy of Why Dogs Make Us Happy , David will make a donation to a dog rescue organization.