Gary is a very good teacher of pure Wyckoff. He specialises in futures, but does stocks as well. There are some health-related issues which can affect his communication but there are a lot of gems if you are patient. He has a starter series on Wyckoff on his website which is good value compared to many others who sell the same sort of stuff. He's very experienced, approachable and is genuinely interested in helping people.
There are a few good people around in the VSA/Wyckoff spectrum that you can learn from. They all say things in varying ways so finding the teacher who explains things in a manner that resonates with you is important.