Mr. O’Callaghan has practiced securities law for over 35 years, for the last 25 years at Blake, Cassels & Graydon LLP, with a particular focus on M&A and corporate finance, including public company acquisition and sale transactions and public and private financings. He has acted as independent counsel to investment dealers and boards of directors and independent committees of boards. He also has extensive experience negotiating and drafting shareholders' and joint venture agreements. Mr. O’Callaghan's clients are exclusively in or connected to the mining sector. He has acted for issuers and underwriters in respect of many mining transactions in Canada, the United States, South America, Africa, China and Australia.