 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).Matheson wrote screenplays for several television programs including the Westerns "Cheyenne", "Have Gun – Will Travel", and "Lawman".He is most closely associated with the American TV series "The Twilight Zone", for which he wrote more than a dozen episodes, including "Steel" (1963), "Nightmare at 20,000 Feet" (1963), "Little Girl Lost" (1962), and "Death Ship" (1963).