Mary Frontczak Mary Frontczak, chief legal officer and corporate secretary of Compass Minerals.

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.

Toman parted ways with Compass in July as part of several "organization changes," which included the appointment of a new chief operations officer for the firm's global operations. The company has 21 production facilities in the U.S., U.K., Canada and Brazil. Its rock salt mine in Goderich, Ontario, is located 1,800 feet under Lake Huron, and is the largest underground salt mine in the world.

Compass is the biggest rock salt producer in North America and the U.K., where it also operates a secure records storage facility in a retired salt mine 500 feet underground. The firm reported a second-quarter net loss of $11.8 million, compared to a loss of $7.6 million in the second quarter of 2018.

Frontczak arrives at Compass after having spent the past two years as the general counsel and senior vice president of POET. She has led the biofuel firm's legal team at its corporate headquarters in Washington, D.C., and provided "strategic and tactical guidance on legal and government affairs and policy issues," according to her LinkedIn profile

At POET, Frontczak automated legal budgeting and established a request-for-proposal process that has allowed the company to whittle down the number of outside firms that it hires and to reduce legal spending. 

Attempts to speak with Frontczak were not immediately successful. 

Compass president and CEO Kevin S. Crutchfield said in a written statement that Frontczak's "deep legal, governance and management expertise, along with her wealth of experience in both the mining and agribusiness sectors, make her the perfect fit" to serve as the company's chief lawyer. 

She began her in-house career at The May Department Stores Co., where she joined as counsel and was promoted to senior counsel, according to her LinkedIn bio. She went on to serve as senior vice president and general counsel of the Americas at Peabody Energy Corp. and as vice president of corporate and legal affairs for Bunge North America. 

At Bunge, a global agribusiness and food ingredient firm, Frontczak worked with the executive leadership team and oversaw an in-house team focused on business and legal issues in the U.S., Canada and Mexico.