James Laurie "Deacon" White was an American baseball player who was one of the principal stars during the first two decades of the sport's professional era. The outstanding catcher of the 1870s during baseball's barehanded period, he caught more games than any other player during the decade, and was a major figure on five consecutive championship teams from 1873 to 1877 – three in the National Association (NA), in which he played throughout its five-year existence from 1871 to 1875, and two in the National League (NL), which was formed as the first fully recognized major league in 1876, partially as a result of White and three other stars moving from the powerhouse Boston Red Stockings to the Chicago White Stockings. Although he was already 28 when the NL was established, White played 15 seasons in the major leagues, completing a 23-year career at the top levels of the sport.

The National Association of Professional Base Ball Players (NAPBBP), often known simply as the National Association (NA), was the first fully-professional sports league in baseball. The NA was founded in 1871 and continued through the 1875 season. It succeeded and incorporated several professional clubs from the previous National Association of Base Ball Players (NABBP) of 1857–1870, sometimes called "the amateur Association". In turn, several NA clubs created the succeeding National League of Professional Baseball Clubs, which joined with the American League of Professional Base Ball Clubs to form Major League Baseball (MLB) in 1903.