Daniel Salvator Duva (7 November, 1951 – 28 January, 1996) was a boxing promoter who promoted or co-promoted over 100 world championship fights through his family run business Main Events. Among these were 12 world championship fights. Dan Duva was the son of prominent boxing trainer Lou Duva. He was one of the earliest promoters to achieve financial success in the pay-per-view market. He gained prominence in the boxing world through the 1981 promotion of the Leonard vs. Hearns welterweight championship fight, which grossed $40 million in pay-per-view and closed circuit revenue. Duva's career ended early due to a brain tumor. Lou Duva (born May 28, 1922) is a boxing trainer who was born in Manhattan, New York, but moved to Paterson, New Jersey at a very early age. ... Pay-per-view is the name given to a system by which television viewers can call and order events to be seen on TV and pay for the private telecast of that event to their homes later. ... The two fights between Sugar Ray Leonard and Thomas Hearns in 1981 and 1989 were among the most eagerly anticipated confrontations in the history of boxing. ... A brain tumour is any intracranial mass created by an abnormal and uncontrolled growth of cells either normally found in the brain itself: neurons, glial cells (astrocytes, oligodendrocytes, ependymal cells), lymphatic tissue, blood vessels), in the cranial nerves (myelin producing Schwann cells), in the brain envelopes (meninges), skull, pituitary and...