Our Certification Team

For urgent inquiries, call 608-310-6748.

To streamline non-urgent services, contact Denise Williamson at 608-310-6739 (office).


Feel free to contact the DrJ team members listed below or use our contact form.

Tim Ahrenholz
Project Engineer
587-220-9575
email Tim

Lindsay Braxler
Sales Support
608-310-6730
email Lindsay

Jessie Clark
Technical Writer/Engineer
608-310-6704
email Jessie

Ryan Dexter, P.E.
Vice President
608-310-6744
email Ryan

Ellen Henderson, P.E.
Project Engineer
608-310-6705
email Ellen

Nicole Mathew
Associate AIA
608-310-6747
email Nicole

Angie Protexter
Sales Manager
608-310-6743
email Angie

Evie Reinke
Customer Support Manager
608-310-6721
email Evie

Matt Tanger
Technical Writer
608-310-6771
email Matt

Jim Vogt, P.E.
Vice President
608-310-6703
email Jim

Larry Wainright
VP of Technical Services
608-310-6742
email Larry