Dennis Keiffer is one of the more persistent actors of his generation with credits spread across cinema, television and everything between. In cinemas, 'Iron Man 3' is the work that stuck — Extremis Soldier, specifically. 'Birds of Prey (and the Fantabulous Emancipation of One Harley Quinn)' rounds out the better-known part of the filmography. The early stretch of the career is the part least seen today. There are 88 entries on the filmography, most of them supporting work in other people's stories. Read more