The top lawyer for one of the world’s biggest biofuel firms is leaving the position to serve as chief legal officer and corporate secretary at Compass Minerals International Inc., a global company that operates Earth’s largest rock salt mine. 

Mary Frontczak is set to take the helm of the legal department at Overland Park, Kansas-based Compass on Nov. 6. Her hiring follows the departure of the firm’s senior vice president and general counsel, Diana Toman.