About Us

A different kind of company requires a different kind of person. Our team comes from companies large and small, both public and private. Solving problems is our passion and we have each made it our priority to be an Expert in our field.

Our Team

Carl Yost

Chairman / CEO

Carl Yost brings more than 25 years experience in business consulting to help clients transform …

See Full Bio

Randy Werder

President / Co-Founder

Randy Werder brings over 30 years of business and industry experience. He is Co-Founder of …

See Full Bio

Sherri Schaffroth

Managing Partner

Sherri Schaffroth brings over 20 years’ experience in strategic new business development, marketing, and sales …

See Full Bio

Damon Mittleider

Chief Product Officer

Damon is one of Black Diamonds founding partners and leads the Product Development Group. He …

See Full Bio

Jeff Flak

Practice Manager

Jeff is an accomplished Practice Manager with Black Diamond Advisory, bringing over ten years of …

See Full Bio

Your Results Are What Matters

With dedicated one-on-one guidance, your Customer Success team helps you define solution goals and achieve them. As an extension of your team, we partner with you to continually evolve and optimize your OneStream investment. We target the key results that matter to your business and leverage Quarterly Business Reviews (QBR’s) to ensure alignment and focus.

User Adoption

Employee Engagement


Leader Performance

Vision & Values


Powered By:

We leverage the leading customer success organization to partner with Black Diamond on every engagement to ensure we achieve ongoing customer success with OneStream Software. We apply state of the art Customer Success technology to understand user adoption and proactively manage solution growth and satisfaction. From voice of the customer scoring to adoption playbooks we know how to continue to drive incremental value improvement.


Black Diamond operates out of Denver, New York, Chicago, Omaha, Kansas City, Pittsburgh, Atlanta, Charleston, Orlando, Toronto, Montreal, Calgary and London with immediate plans for California. Wherever you are, we're never far away!