2624 Heartland Drive
Sheridan, WY  82801
(307) 672-7133 Office
(307) 672-7143 Fax


The senior employees of the firm have over a century of experience in our focus disciplines that spans the United States, with a primary focus in the Mountain West states.  The experience of our staff dates back to the 1970s, much of which originated in coal mining.  Since then we have accumulated hands-on experience in our focus disciplines that has benefited clients throughout the mountain west and Alaska. Through the acquisition of professional talent with a wide variety of skills and credentials, we  provide expert consulting services that are well-respected among clients and regulators.



ATC was established in 1991 by individuals whose careers began in mining in the mid-1970s.  Since then the firm has evolved into a tight-knit group of professionals with a broad spectrum of experience and a long-term dedication to moving ATC forward into the future.  After more than a decade of conducting business out of an old grade school, continuing success moved our firm in 2007 into a newly-built office complex conducive to improved staff productivity, finished with first-rate amenities for meetings, client interactions and technical sessions.