Sarah Wassner Flynn has authored several children's nonfiction books for National Geographic. Her most recent titles include Weird But True Know It All: Greek Mythology, This Book is Cute! (out March 2019), The Ultimate Book of Sharks, This Book Stinks!: Gross Garbage, Rotten Rubbish, and the Science of Trash, Awesome 8 Extreme, and 1,000 Facts About the White House, Animal Records and Awesome 8. She has also contributed to the New York Times-bestselling National Geographic Kids Almanac as well as the popular Weird But True series books, including Weird But True GrossWeird But True Food, and Weird But True Christmas.

A competitive amateur triathlete, Sarah has earned All-American honors from USA Triathlon for four years in a row, placing 7th in the nation at the Olympic distance for her age-group in 2017. Also in 2017, she qualified to represent Team USA at three different World Championships (Olympic distance, 70.3, and Aquathlon). 

Sarah is a frequent contributor to USA Triathlon Magazine, Triathlete Magazine, Women’s Running Magazine, Girls' Life Magazine, and other health and fitness-focused websites and publications.

Sarah lives, writes, and trains in the suburbs of Washington, DC with her husband and three children.