Who invented the ADX indicator?

Can you tell me, who exactly was the mastermind behind the creation of the ADX indicator? I've heard it's a popular tool in technical analysis, but I'm not quite sure who had the brilliance to conceive such a useful metric for traders. I'm curious to learn more about the origins and the thinking behind this indicator, as it seems to play a pivotal role in many trading strategies. So, who deserves the credit for inventing the ADX indicator?