Answer
Jennings, played by David Warner in'The Omen', is the mysterious photographer who assists Robert Thorn in photographing the birth of the Antichrist. He manipulates events behind the scenes, ensuring that the child is adopted by Thorn and his wife, setting the stage for the fulfillment of the Biblical prophecy. Jennings' sinister nature and enigmatic presence add layers of suspense and complexity to the film's narrative.