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Martin Edward Schottenheimer (; September 23, 1943 – February 8, 2021) was an American football linebacker and coach who served as a head coach in the National Football League (NFL) for 21 seasons. He was the head coach of the Cleveland Browns from 1984 to 1988, the Kansas City Chiefs from 1989 to 1998, the Washington Redskins in 2001, and the San Diego Chargers from 2003 to 2006. Eighth in career wins at 205 and seventh in regular season wins at 200, Schottenheimer has the most wins among the league's head coaches to not win an NFL championship. After coaching in the NFL, he won a 2011 championship in his one season with the Virginia Destroyers of the United Football League (UFL). He was inducted to the Kansas City Chiefs Hall of Fame in 2010.
In his 21 seasons, Schottenheimer reached the playoffs 13 times and had only two losing records. Schottenheimer also was named NFL Coach of the Year with the Chargers in 2004 for leading a team that went 4–12 the previous year to a 12–4 record. However, he won only five of his 18 postseason games and never advanced beyond the conference championship round of the playoffs. Schottenheimer concluded his NFL career with a .613 regular season winning percentage, but a .278 playoff winning percentage, which is the only losing playoff record for an NFL coach with at least 200 wins. He is the only eligible NFL coach with at least 200 regular season wins who has not been inducted to the Pro Football Hall of Fame.