Dr O'Sullivan regarded leadership as engaging people, nurturing ideas, dreams and aspirations, but also being part of the audience.
He illustrated that by recalling hearing the United States Secretary for Indian Affairs earlier this year, which culminated in an invitation to dispatch a contingent of young Maori leaders to a conference of young native Americans in Washington.
He had addressed a gathering of the Corporate Law Association shortly after that invitation was extended, and left with $10,000 worth of sponsorship.
Three weeks later he had the $35,000 he needed.
"These young people will be great leaders," he said.
"We should be creating the people who will make me redundant - but not too soon; I have a mortgage."
Communication, he added, could break down barriers, and he was fortunate that his culture and his profession allowed him opportunities to share ideas about his country and how to be part of it.