Here are some of his most notable projects:
Films:
* The Incredible Shrinking Man (1957): Screenplay
* The Twilight Zone (1959): Wrote numerous episodes
* The Pit and the Pendulum (1961): Screenplay
* A Stir of Echoes (1960): Novelist
* The Night Stalker (1972): Screenplay
* The Last Man on Earth (1964): Screenplay
* The Legend of Hell House (1973): Novelist
* I Am Legend (1964): Novelist
* What Dreams May Come (1998): Novelist
Television:
* The Twilight Zone (1959-1964): Numerous episodes
* The Outer Limits (1963-1965): Numerous episodes
* The Alfred Hitchcock Hour (1962-1965): Numerous episodes
* The Night Gallery (1969-1973): Numerous episodes
* Kolchak: The Night Stalker (1974): Creator and writer
* Thriller (1960-1962): Numerous episodes
This list only includes some of his many projects, as he contributed to numerous other works throughout his career.
It's important to note that while he did not appear on screen as an actor, his writing has had a significant impact on the genres he worked in, and many of his stories have been adapted for television and film.