Donald E. Ackerman

W.L. Hailey & Co., Inc. has been building trust since its inception in 1925. Even in hardships the company has adapted to a constantly changing environment while staying committed to its time honored principles of professionalism and integrity. The company takes prides in the many critical infrastructure projects which are completed. As the company begins its ninth decade of existence as an employee-owned company, it is committed to excellence and the development of its people. Hailey is dedicated to excel in the delivery of critical infrastructure solutions.

Society of Mining Engineers represents all professions serving the mining, minerals and underground construction industries. Its memebers include engineers, geologists, metallurgists, educators, students and researchers. The company was founded in 1871 and is headquartered in Wapwallopen, PA.

Traylor Bros., Inc. builds tunnels, bridges, and heavy constructions. It also offers dams and ports, storm sewers, and transmission lines. The company was founded in 1946 by William F. Traylor and is headquartered in Evansville, IN.

Part of Tutor Perini Corp., Frontier-Kemper Constructors, Inc. specializes in heavy civil construction and underground mine development. The company is based in Evansville, IN. The company is known for their expertise in the engineering and construction of deep shafts and tunnels of all sizes and complexity. The company's FKC-Lake Shore division provides design/build/install services for innovative hoisting and vertical conveyance systems. The company offers comprehensive mine development projects, turn-key hoisting solutions, and innovative design-build hoisting & vertical conveyance equipment for the transport of personnel and materials. Frontier-Kemper Constructors was acquired by Tutor Perini Corp. from Bauunternehmung E. Heitkamp GmbH on June 02, 2011 for $61 million.