<Tr> <Th> Known for </Th> <Td> Owner of the Oakland Raiders </Td> </Tr> <Tr> <Th> Net worth </Th> <Td> US $500 million dollars (October 2015) </Td> </Tr> <P> Mark Davis (born 1954 or 1955) is the principal owner and managing general partner of the Oakland Raiders of the National Football League (NFL). </P> <P> Prior to owning the team Davis was involved in the retail part of the Raider's business where he helped develop the organization's Raider Image stores . He also spent time in the Raiders equipment department where he developed the muff - style hand warmer for football . In 1980, Davis then age 25 represented Raiders player Cliff Branch in contract negotiations with the team and his father Al which resulted in a deal that included an annuity that still today pays Branch and got Mark kicked out of his father's house for being too close to the players . He later lived with Branch when the team moved to Los Angeles . </P>

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