In science fiction, a large number of the practitioners and other professionals in the field, not only writers but editors and publishers, traditionally have themselves come from and participate in science fiction fandom, from Ray Bradbury and Harlan Ellison to Patrick Nielsen Hayden and Toni Weisskopf. Ed Brubaker was a fan of the Captain America comics as a kid and was so upset that Bucky Barnes was killed off he worked on ways to bring him back.