David Crawford is an American author best known for his post-apocalyptic novel "Lights Out," originally published under the pen name HalfFast. The book, which first appeared as a serialized story online, explores survival in the aftermath of a massive electromagnetic pulse attack that cripples modern civilization. Crawford's background and attention to detail in depicting societal collapse and practical survival scenarios resonated with readers, making "Lights Out" a cult classic in the survivalist fiction genre. His realistic approach to the challenges of living without modern infrastructure has earned him a dedicated following among apocalyptic fiction enthusiasts.