Our Team

MTJ’s dedicated engineers are at the heart of our mission, applying innovative traffic planning and operational analysis to create safe, efficient, and multimodal transportation systems. Guided by our shared values, we design solutions that move people of all ages and abilities easily and reliably through roundabouts.

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Mark T. Johnson, P.E.

Founder and CEO

As an early adopter of roundabout applications and design, Mark Johnson, PE, has helped shape the evolution and acceptance of roundabouts in North America. His journey began 30 years ago when roundabouts were still a rarity in traffic and roadway engineering. Through expertise, advocacy, and innovation, he has contributed significantly to the paradigm shift in traffic design that has made roundabouts a widely accepted solution for safer, more efficient transportation networks.

A Career Built on Innovation & Expertise

Mark’s early career as a transportation development review engineer for the City of Loveland, CO (1994-1998) and later as a traffic engineer and planner for a small Fort Collins-based consultancy (1998-2001) gave him first-hand insight into the challenges of finding multi-modal solutions with traditional traffic planning and signalization.

Recognizing the potential of roundabouts to improve safety, efficiency, and multimodal integration, he pursued extensive training and mentorship first with Lief Ourston followed by UK roundabout expert Barry Crown—who later remarked:

“Mark’s understanding of the relationships between traffic planning, multi-modal objectives, roadway, and roundabout design is a rare combination of skills that truly sets him apart. His ability to envision the big picture utilizing roundabouts’ unique attributes before delving into the details is invaluable.”

Shaping Policy & Best Practices in Roundabout Design

Mark’s tenure at the Wisconsin Department of Transportation (2001-2005) was pivotal in launching the state’s first roundabout program, where he served as a statewide resource for public outreach, feasibility, analysis, and design. His efforts helped establish best practices that continue to influence modern roundabout implementation.

MTJ Roundabout Consulting: Leading the Industry Since 2005

In 2005, Mark founded MTJ Roundabout Consulting, working with project teams across North America to deliver successful, well-received roundabout projects.

    • Active member of TRB and ITE Roundabout Committees

    • Co-author of the 2010 FHWA Roundabout Guide (NCHRP 672)

    • Key contributor to the WIDOT Roundabout Program

    • Provided technical guidance to multiple agencies’ programs

    • Trusted partner to numerous agencies and consultants across N. America

    • Special Recognition Research Partnership 2014 -Center for Transportation Studies, Univ. of Minnesota: Effect of Signing and Striping on the Safety of a Two-Lane Roundabout

    • WisDOT Quality Service Award - 2004

    • Mark has authored or co-authored multiple TRB research papers with many being published and presented on roundabout subjects including Capacity Analysis, Access Considerations, Capacity, Pedestrian and Bicycle Safety and Comfort

    • Delivered hundreds of presentations to Industry conferences, Public and Elected officials’ meetings

    • Roundabout Training Workshops Developed and Instructed:

      • OH LTAP webinar(s) 2022 - 2023

      • SD DOT Analysis and Design 2024

      • California DOT (Caltrans), 2017-2019

      • Co-Instructor with FHWA in Every Day Counts 2 program: Florida DOT and Arkansas DOT, 2014.

      • University of Wisconsin, Civil and Environmental Engineering – Professional Development, 2005-2009.

      • Instructor for C-TEP and EPIC Education across Canada from 2012-2019.

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Craig Donze


Vertical Design Review, CAD

Craig provides vertical design, civil design, and reviews. Craig has 25 years of design and construction project management experience, specializing in the geometric design of urban roadways. Over the past 20 years, Craig and MTJ have worked on over 60 roundabout projects.

Craig’s expertise allows the MTJ team to provide vertical design services. Craig’s experience offers senior-level vertical design recommendations in a review or direct design mode capacity. This is delivered in Civil 3-D and/or red-line comments for incorporation by the prime firm or agency design team. This has proven to create savings in project schedules, design fees, and construction costs.

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Justin Packard

Sr. Graphic Designer/Visualization

Justin has 20 years of experience creating a wide range of technical graphics work, specializing in illustration and conceptualization, and develops 3D visualization, modeling, fly-through videos, and planning materials to provide visual consensus among members of the design/approval teams. Justin’s work and skills illustrate:

  • Accurate representations of proposed improvements

  • 2-D exhibits/planning materials for review and consensus-building

  • Safety performance check documentation

  • Adobe Creative Suite (Illustrator, Photoshop,

  • In-Design, Acrobat), Lightwave 3D.