Cornerstone Management Services Celebrates 20 Years in Big Sky

Paul Williamson, director of business development, shares his path to the high-alpine community and the company's commitment to the region.

Feb. 3, 2026 at 8:47pm

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Paul Williamson, the director of business development at Cornerstone Management Services, a company specializing in exterior envelope contracting for high-alpine environments, discusses his journey to Big Sky, Montana, and the growth of the 20-year-old business. Williamson talks about his background in communications and how he transitioned into the construction industry, as well as Cornerstone's involvement in the local community and plans for future expansion.

Why it matters

Cornerstone Management Services' two-decade presence in Big Sky highlights the resilience and adaptability required to thrive in the region's challenging high-alpine environment. The company's commitment to the community and focus on sustainable, climate-resilient building practices are important factors in the area's continued development.

The details

Williamson moved to Big Sky about seven years ago, initially working as a subcontractor for Cornerstone before transitioning into operations and now serving as the director of business development. The company specializes in roofing, waterproofing, siding, and other exterior systems designed for high-alpine conditions. Cornerstone has about 30 internal team members and works with 70 additional installers during peak times. The company is now looking to expand its services to the greater Gallatin Valley, including Bozeman and Belgrade, while maintaining its focus on the Big Sky community.

  • Cornerstone Management Services was founded 20 years ago.
  • Williamson moved to Big Sky about seven years ago.

The players

Paul Williamson

The director of business development at Cornerstone Management Services, a company specializing in exterior envelope contracting for high-alpine environments.

Cornerstone Management Services

A 20-year-old exterior envelope contractor focused on long-term, sustainable exterior systems designed and tested specifically for high-alpine environments in Big Sky, Montana.

Andy Dreisbach

The founder and owner of Cornerstone Management Services, who lives in Big Sky and raised his family there.

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What they’re saying

“Big Sky offered a balance of career opportunities and quality of life.”

— Paul Williamson, Director of Business Development

“We wouldn't be where we are today without the Big Sky community. We sponsor local events, partner with the Big Sky Chamber and support organizations like Big Sky Youth Empowerment.”

— Paul Williamson, Director of Business Development

What’s next

Cornerstone Management Services plans to continue expanding its services to the greater Gallatin Valley, including Bozeman and Belgrade, while maintaining its focus on the Big Sky community.

The takeaway

Cornerstone Management Services' two decades of success in Big Sky demonstrate the value of a company that is deeply rooted in and committed to the local community, while also adapting and innovating to meet the unique challenges of the high-alpine environment.