Who led both leagues in era?

In Major League Baseball, the Earned Run Average (ERA) leaders for both the American League and the National League are typically recognized at the end of each season. As of my last update in October 2023, the most recent player to lead both leagues in ERA over their career was Dwight Gooden, who accomplished this feat in the late 1980s and early 1990s. However, for the most accurate and up-to-date information on recent seasons, please check the latest statistics.