What martial art does The Equalizer use?

Can you tell me which martial art The Equalizer employs in his fighting style? It's intriguing to learn about the physical prowess and combat techniques that he utilizes to bring justice to those in need. It's likely that his skills in this particular discipline have played a pivotal role in his ability to neutralize threats and protect the innocent. So, what is the martial art that The Equalizer has mastered to such a high degree?