article_snippet: Ian Paterson, the former headmaster of Sydney's Knox Grammar School, gave evidence .
article_snippet: A former Roseville College student, Lucy Perry, accused Dr Paterson of touching Dr Paterson on the buttocks, which Dr Paterson denies .
article_snippet: Explosive claims have been made during the hearing, including allegations of extensive abuse carried out at Knox Grammar School on Sydney's North Shore.
article_snippet: Dr Ian Paterson, Knox Grammar School on Sydney's North Shore's headmaster from 1969 to 1998, admitted to impeding a police investigation into allegations of paedophilia from teachers while he was giving evidence earlier this month.
article_snippet: While a former Roseville College student, Lucy Perry, told the inquiry about an incident where she claims Dr Paterson Dr Paterson touched she on the buttocks during a joint rehearsal of a musical with Knox.
article_snippet: But Dr Paterson has vehemently denied the allegation, saying Dr Paterson 'absolutely not' touch Ms Perry in 1989 when Ms Perry was 15.