Deliberate Practice – Where Self-reflection, Work Ethic and Ambition Meet

http://www.psy.fsu.edu/faculty/ericsson/ericsson.exp.perf.ht...

Link to his most famous paper (on another college professor's, not the author's, site):

http://projects.ict.usc.edu/itw/gel/EricssonDeliberatePracti...

John Danaher is a Brazilian Jiu-Jitsu black belt under Renzo Gracie who trains and teaches in NYC at Renzo's school. Everyone who rolls with him - including other black belts, some world champions - are amazed with his abilities. I've had the privilege of attending a class taught by him, and it was immediately obvious that this man knows BJJ like few others.

A quote from the article:

Danaher remains [Renzo Gracie's] most prolific instructor and regularly spends upwards of 12 to 14 hours per day at his Manhattan academy teaching classes and private sessions. Gracie hinted at Danaher’s unquenchable thirst.

“When Johnny first came in here, he was like 250 [pounds]; he was a real monster. He was lifting weights every day, you know, like a bodybuilder,” Gracie says. “Now, he does jiu-jitsu every day; we can’t get him out of here. I think he would come in on Christmas if we would let him.”