Major League Baseball logo

The official logo of Major League Baseball was designed by Jerry Dior in 1968, when MLB commissioned the marketing firm Dior worked at to create a logo for the centennial celebration of professional baseball, set to take place in 1969. The logo first appeared on uniforms during the 1969 season.

The ubiquitous design includes a white silhouette of a batter -- popularly thought to be Hall of Famer Harmon Killebrew -- flanked by a backdrop of blue and red. Dior has said that he did not model the logo after any one player and instead made it intentionally ambiguous in every way, including the batter's side of the plate.