Our 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.

Ryan Dexter, P.E.
Vice President
608-310-6707

John Fredrick
Sales
608-310-6734
email John

Matt Tanger
Technical Writer
608-310-6771
email Matt

Jim Vogt, P.E.
Vice President
608-310-6707

Larry Wainright
Vice President, Technical Services
608-310-6742
email Larry

Denise Williamson
Scheduling and Sales Support
608-310-6739
email Denise