Although the characters were introduced while Marv Wolfman was writing "Spider-Woman", their origin and identities were not revealed until Mark Gruenwald's run on the series. Questioned as to whether he had told Gruenwald the characters' origin or Gruenwald had come up with it himself, Wolfman admitted that he could not even remember if the origin he had originally envisioned for the characters was the same as the one ultimately used by Gruenwald, except that "Brother Grimm" actually being two people was his intention from the beginning. Though Wolfman could not remember how the Brothers Grimm were created, he has said he is confident that their visual design must have come from series penciler Carmine Infantino: "I usually gave the artist a concept of what I wanted and then let them have a field day with it. Carmine created brilliant designs in "The Flash", so I would certainly have bowed to his expertise."