Reynold Brown was one of the most prolific if not the most prolific movie poster artist in Hollywood during the 1950s and 1960s. From big studios to low budget ones, Brown basically created the "look" of sensational movie posters back in the day. I really admire him. He was a genius. Most of his posters are one the web so just google him to see his endless number of films. Here's a link with many of his most famous titles.
Poster art for WAR OF THE ZOMBIES also known as ROME AGAINST ROME