That's correct. Matheson wrote the screenplay for The Martian Chronicles miniseries back in the 1980's.
As a screenwriter, he also wrote movie adaptations of MASTER OF THE WORLD (by Jules Verne), DRACULA (starring Jack Palance), THE NIGHT STALKER (based on a novel by Jeff Rice), THE DEVIL RIDES OUT (based on the occult novel by Dennis Wheatley), and, of course, various Poe movies with Vincent Price: HOUSE OF USHER, THE PIT AND THE PENDULUM, THE RAVEN, and TALES OF TERROR. He also wrote a TV-movie biography of L. Frank Baum, THE DREAMER OF OZ, among many other projects.
Someone was just pointing out on Facebook that Matheson is the only writer whose TWILIGHT ZONE episodes have been remade as feature films twice,
with THE BOX and REAL STEEL. (Three times if you count the "Nightmare at 20,000 Feet" segment in TWILIGHT ZONE: THE MOVIE.)