I know he developed MILD, but what other techniques did he develop?
He built on the work of Paul Tholey quite a bit. Tholey “came up with” the Intention technique, and LaBerge, I believe, “came up with” the combined Intention/Reflection technique–which is using autosuggestion and reality checks together.
Of course, lucid dreaming techniques have been around for thousands of years, so modern descriptions of techniques are really just rehashes.
What LaBerge did, that no one before him did, is develop a technological way of inducing lucidity by wearing goggles that flash LED lights at you once you enter REM sleep.
I’m pretty sure he also developed WBTB and the Spinning Technique.