Durrant: Detailed Company Information & Corporate Profile
Summary
Durrant is headquartered in Dubuque, Iowa and employs a dedicated team of 100 to 200 specialists focused on construction design.
With expertise across justice, education, healthcare, federal projects, sustainable design, retail, and mixed‑use developments, the firm delivers tailored solutions that meet rigorous functional and environmental standards. The leadership roster—Project Coordinator Roberta Giltner, Owner William Siebers, Principal Dan Olson, Mechanical Designer Mary Hirsch, Mechanical Engineer Dieter Muhlack, Licensed Plumbing Designer Mike Pederson, Structural Engineering Technician Jared Tatro, Intern Architect Kristopher Werner, and associate Kelvin Powell—guides the firm’s multidisciplinary approach to client projects.
| Industries | |
| Durrant Headquarters Address | 400 Ice Harbor Drive, Dubuque, Iowa, 52001 US |
| Company Size | 100-200 employees |
| Specialities & Services | justice, education, healthcare, federal, sustainable design, retail, mixed use |
| Updated: | 2026-09-16 |
Workforce Turnover
Length of Employment
Durrant's workforce includes employees across a wide range of tenure levels.
100% have been with the company for more than 11 years
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Durrant Corporate Information: FAQ
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