All-America Football Conference (1946–1949)
National Football League (1950–present)
San Francisco i/ /, officially the City and County of San Francisco, is the leading financial and cultural center of Northern California and the San Francisco Bay Area.
The only consolidated city-county in California, San Francisco encompasses a land area of about 46.9 square miles (121 km2) on the northern end of the San Francisco Peninsula, giving it a density of about 17,620 people per square mile (6,803 people per km2). It is the most densely settled large city (population greater than 200,000) in the state of California and the second-most densely populated major city in the United States after New York City. San Francisco is the fourth most populous city in California, after Los Angeles, San Diego and San Jose, and the 14th most populous city in the United States—with a Census-estimated 2012 population of 825,863. The city is also the financial and cultural hub of the larger San Jose-San Francisco-Oakland metropolitan area, with a population of 8.4 million.
The National Football League (NFL) is a professional American football league composed of 32 teams divided equally between the National Football Conference (NFC) and the American Football Conference (AFC). The highest professional level of the sport in the world, the NFL runs a 17-week regular season from the week after Labor Day to the week after Christmas, with each team playing sixteen games and having one bye week. Out of the league's 32 teams, six (four division winners and two wild-card teams) from each conference compete in the NFL playoffs, a single-elimination tournament culminating in the Super Bowl, played between the champions of the NFC and AFC. The champions of the Super Bowl are awarded the Vince Lombardi Trophy. Various other awards exist to recognize individual players and coaches. Most games are played on Sunday afternoons; some games are also played on Mondays and Thursdays during the regular season. There are games on Saturdays during the last few weeks of the regular season and the first two playoff weekends.
The NFL was formed on August 20, 1920, as the American Professional Football Conference; the league changed its name to the American Professional Football Association (APFA) on September 17, 1920, and changed its name to the National Football League on June 24, 1922, after spending the 1920 and 1921 seasons as the APFA. In 1966, the NFL agreed to merge with the rival American Football League (AFL), effective 1970; the first Super Bowl was held at the end of that same season in January 1967. Today, the NFL has the highest average attendance (67,591) of any professional sports league in the world and is the most popular sports league in the United States. The Super Bowl is among the biggest club sporting events in the world and individual Super Bowl games account for many of the most-watched programs in American history. At the corporate level, the NFL is a nonprofit 501(c)(6) association. The NFL's executive officer is the commissioner, who has broad authority in governing the league.
The All-America Football Conference (AAFC) was a professional American football league that challenged the established National Football League (NFL) from 1946 to 1949. One of the NFL's most formidable challengers, the AAFC attracted many of the nation's best players, and introduced many lasting innovations to the game. However, the AAFC was ultimately unable to sustain itself in competition with the NFL. Three of its teams were admitted to the NFL: San Francisco 49ers, Cleveland Browns and Baltimore Colts (not related to the later NFL team that would play in Baltimore from 1953 through 1983, now the Indianapolis Colts).
The AAFC was the second American professional sports league (the first being the third American Football League) to have its teams play in a double round robin format in the regular season: each team had a home game and an away game with each of its AAFC fellow foes.
The Super Bowl is the annual championship game of the National Football League (NFL), the highest level of professional American football in the United States, culminating a season that begins in the late summer of the previous calendar year. The Super Bowl uses Roman numerals to identify each game, rather than the year in which it is held. For example, Super Bowl I was played on January 15, 1967, following the 1966 regular season, while Super Bowl XLVII was played on February 3, 2013, following the 2012 season.
The game was created as part of a merger agreement between the NFL and its then-rival league, the American Football League (AFL). It was agreed that the two leagues' champion teams would play in the AFL–NFL World Championship Game until the merger was to officially begin in 1970. After the merger, each league was redesignated as a "conference", and the game was then played between the conference champions. Currently, the National Football Conference (NFC) leads the league with 25 wins to 22 wins for the American Football Conference (AFC). The Pittsburgh Steelers hold the record for Super Bowl victories with six.
Michael "Mike" Singletary (born October 9, 1958) is an American football coach and former professional football player. He is currently the linebacker coach and an assistant to the head coach for the Minnesota Vikings of the NFL.
After playing college football for the Baylor Bears, Singletary was drafted by the Chicago Bears in the 2nd round of the 1981 NFL Draft and was known as "The Heart of the Defense" for the Chicago Bears' Monsters of the Midway in the mid-1980s. He was inducted into the Pro Football Hall of Fame in 1998. Singletary later pursued a career as a coach, first as a linebackers coach for the Baltimore Ravens, then as the linebackers coach for the San Francisco 49ers. In 2008, the 49ers promoted Singletary to the head coaching position after previous head coach Mike Nolan was fired during the season and he remained in that position until the conclusion of the 2010 season when he was fired.
George Seifert (born January 22, 1940) is a former American football player and coach. He served as the head coach for the San Francisco 49ers and the Carolina Panthers of the National Football League (NFL). Seifert joined the 49ers' coaching staff under Bill Walsh in 1980 as defensive backs coach and served as the team's defensive coordinator from 1983 to 1988.
As a 49er assistant, his defenses finished in the top ten in fewest points allowed in each of his six seasons in that capacity: fourth in 1983, first in 1984, second in 1985, third in 1986 and 1987, and eighth in 1988. His final two defenses, 1987 and 1988, finished first and third in fewest yards allowed, respectively. On his 49th birthday, the 49ers won the Super Bowl in 1988.