Premise: Mark Baltz is a former official in the National Football League (NFL) from 1989 through 2013. He has worked as a head linesman throughout his entire career in the NFL and has been assigned to 21 post-season games, including five conference championship games (1998, 1999, 2000, 2001, 2004). He wore uniform number 26.
Hypothesis: Mark Baltz belongs to the National Football League.