Bozeman, MT


In 2019, we officially opened an office in Bozeman to support our clients with construction observation and materials testing. The location is managed by James Kellogg (who also oversees the Glenwood Springs office).




153 Shepherd Trail, Unit G

Bozeman, Montana 59718

Tel: (406) 551-9125

Fax: (406) 551-9125


James Kellogg

Division Manager

James moved into the role of Glenwood Springs Division Manager in 2016, and now oversees the Bozeman, MT office as well. He oversees daily operations, staff development, client relations and business development for the division while contributing to overall management and growth of the company. James is also intimately involved with engineering analysis and design, as well as technical review.

Ryan DeMars

Staff Engineer, Field Supervisor

Ryan has been with CTL | Thompson since 2017. He began as an Engineering Field Technician in the Denver Division before assisting in establishing the Bozeman Division as a Staff Engineer in 2019. He directs subsurface investigations and prepares geotechnical reports for residential, commercial and ski area development projects in the Big Sky and Bozeman area. Ryan also leads and supervises Bozeman’s team of Field Technicians.