Fournier first made the Majors in 1912 when he broke in with the Chicago White Sox. Fournier led the American League in Slugging in 1915 (.491), and he batted .322 with a .311 mark the year before. Despite that, he was relegated to a platoon with Jack Ness in 1916, and he began to slump, making him expendable. He was waived, and he went back to the minors. The New York Yankees gave him a shot in 1918, but they released him after feeling his defense was sub-par.
He returned to the bigs with St. Louis in 1920, where he batted over .300 in 1920 and 1921, and in 1923, his first year in Brooklyn, he began a three-year streak where he batted at least .334, had an OBP of .411, a Slugging Percentage well over .500 and 20 HR/100 RBI years. Fournier won the National League. Home Run Title in 1924 (27), and he had a league-leading 86 Walks in 1925.
Fournier played until 1927, retiring with 1,631 Hits and an exemplary Slash Line of .313/.392/.483.