Oil & Gas Talisman parts company with John ManzoniCanadian oil firm Talisman today announced the sudden departure of its president and chief executive, John Manzoni. September 10th 2012, 4:44 pm 2 min read Facebook An icon of a facebook f logo. LinkedIn An icon of the LinkedIn logo. Twitter An icon of the Twitter logo. Canadian oil firm Talisman today announced the sudden departure of its president and chief executive, John Manzoni.