Gregg Olsen is an American author known for his true crime and fiction novels. He was born on March 5, 1959, in Seattle, Washington. Olsen began his writing career as a journalist, working for various newspapers and publications.

In the 1990s, Gregg Olsen transitioned into writing true crime novels, drawing inspiration from real-life cases. His books often explore the darker aspects of crime, focusing on the psychology of both the perpetrators and the victims. Some of his notable true crime works include "Starvation Heights," "Abandoned Prayers," and "If Loving You is Wrong."

Olsen has also written fiction novels, ranging from mystery and thriller genres to young adult fiction. His fiction works often have suspenseful and dark undertones, keeping readers engaged and on the edge of their seats. Some of his popular fiction novels include the "Empty Coffin" series and "The Girl in the Woods."

Throughout his career, Gregg Olsen has received critical acclaim for his ability to weave compelling narratives and for his in-depth research. His books have gained a large following and have been New York Times, Wall Street Journal, and USA Today bestsellers.

In addition to his writing, Olsen is known for his collaboration with Rebecca Morris, another true crime author. They co-authored the popular "Notorious USA" series, which focuses on notorious crimes committed in various American states.

Gregg Olsen continues to write and has published numerous books that have captured the attention of readers around the world. His work appeals to those who have an interest in true crime, psychological thrillers, and gripping mysteries.