The ferocity of the rivalry has made it rare for a player to represent both teams during his career.[6] Players who played for both sides of the Old Firm included Alec Bennett,[7] Scott Duncan, Robert Campbell, and George Livingstone, who all played before the intensity of the rivalry had started prior to 1912, as well as later players: Alfie Conn,[8] Maurice Johnston,[9][10] Kenny Miller,[11][12] Steven Pressley[13] and Mark Brown (none of whom moved directly between the two clubs).