Dave kerr, (Commonly known as Monster-Handler Dave) was the main composer for many years, though he is retired now he is still active on his youtube channel.
Trivia
He uhhhhhhhhh does stuff.
He voiced soooooooo many monsters woowwwwwwwww holyyyyy smokes we got uhhh furcorn and.... furcorn.. and cybop.... and i think riff too... maybe pom pom..... idkk mannnn he could've voiced mimic or maybe even congle wowwwwwww...
He is a firm beliver in eating soup with a spoon.
He voiced all the werdos. every. single. one of them. i know he did. he did did i know.