Sera Siege

She was the publisher of the Supernatural book series. She knew Carver Edlund's real name.

Season 4
She said that the books were being misjudged and wanted them to continue being published. She knew Carver Edlund's real name once Sam and Dean reveal their anti-possession tattoos to her to demonstrate they are hard-core fans after having also revealed knowledge of various other facts from the series, such as the exact make of the car, Sam's birthday, and Dean's favorite songs; she reveals her own anti-possession tattoo and gives them Chuck Shurley's address.

Appearances

 * Season 4
 * The Monster At The End of This Book