To some, he's a god of brain surgery: a doctor willing to push the boundaries to save lives. 

To others, he's a risk taker, and he goes too far. 

This week, Charlie Teo has been appearing before a medical disciplinary commission in relation to the deaths of two of his patients. 

Today, we speak to journalist Isobel Roe, who's been covering the hearings, and we delve back into Charlie Teo's past. 

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Isobel Roe, ABC journalist 

Dr Simon Chapman, Emeritus Professor, School of Public Health, University of Sydney