Between 1984-1996, Cannon was a trial lawyer in the Pittsburgh law firm of Robb, Leonard & Mulvihill, highlighted by a successful representation of the Major League Baseball Players Association.
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233, 261 (W.D. Mo. 1976) aff'd, 532 F.2d 615 (8th Cir. 1976) After all appeals were exhausted, Major League Baseball and the Major League Baseball Players Association signed a new agreement in 1976 allowing players with six years experience to become free agents.