Greg Behrendt is an American stand-up comedian, author, and television consultant. He is best known for co-writing the best-selling book He's Just Not That Into You, which was later adapted into a feature film. He has also written two other books, It's Called a Breakup Because It's Broken and How to Keep Your Marriage From Sucking. He has appeared on numerous television shows, including The Oprah Winfrey Show, The Today Show, and The Ellen DeGeneres Show. He has also been a consultant for the hit HBO series Sex and the City. Behrendt is a sought-after speaker and has been featured at the TEDx conference. He currently lives in Los Angeles with his wife and two children.