Murray Spivack was a Russian-born American sound engineer. He was also a drum teacher whose students included Louie Bellson, Joe Morello, David Garibaldi, Vinnie Colaiuta, Chuck Silverman, Chad Wackerman, Ed Shaughnessy, and many more.
Some years ago I was at the masterclass of drummer Phil Maturano and he spoke about the Spivack technique, I had never heard this before, it was very interesting and caught my curiosity…
Recently my drum teacher spoke to me about this technique, explaining the fundamentals, and the grip, introducing a series of exercises playing the Stick Control (Single Beat Combinations) at very slow metronome speed, focusing on the grip and the mechanic of the stroke.
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Watching this video will help you to understand the grip.