The Omega Man
His other early novels include "The Shrinking Man" (1956, filmed in 1957 as "The Incredible Shrinking Man", again from Matheson's own screenplay) and a science fiction vampire novel, "I Am Legend" (1954) (filmed as "The Last Man on Earth" in 1964, "The Omega Man" in 1971, and "I Am Legend" in 2007).