You can read his biography here, but Chris Marker was an elusive person; he didn’t give interviews, nor did he allow himself to be photographed.
He wanted his work to speak for him, and so it should. Watch La Jetée in its full, French language (English-subtitle) version which is available on YouTube (unless it’s been taken down), and from Criterion Collection. Even if you’ve seen it before, this is one you cannot see too many times. It is among the most perfect films ever made, and one of my all-time favorites.