Death
Death is one of the Endless, 7 siblings introduced in Neil Gaiman's award-winning Sandman series. She is the elder sister of Dream, the main protagonist in The Sandman. She is a character that became instantly beloved by the readers, and remains so to this day.

Death: At Death's Door
Death: At Death's Door ties into the events that are described in the graphic novel Season of Mists, in which Dream goes to make amends for a wrong he committed upon Nada. Death: At Death's Door shows us how the three sisters Death, Delirium and Despair cope with all the dead that have been released from Hell.

Jill Thompson
Jill Thompson is the creator of Scary Godmother and The Little Endless. Her work has featured in comics and books such as The Sandman, The Invisibles, Jingle Belle, the Rinnah Two Feathers Mysteries and many more.

Links
Vertigo's Official Death: At Death's Door Site
Jill Thompson Official Site
Neil Gaiman Official Site
DC Comics Official Site
DC's Official Vertigo Site