At Obermiller Nelson Engineering, Inc. (ONE), our mission is to enrich the lives of our employees and exceed the expectations of our clients. We accomplish this by providing professional, detailed Mechanical, Electrical and Civil design and coordination for building systems.


Our Duluth team has a longstanding history in the Twin Ports, the Iron Range and the Arrowhead Region having completed thousands of projects in those areas. Our team members provide the workforce and experience to accommodate several different project types. With licensed Mechanical Engineers, Electrical Engineers, Civil Engineers, Fire Protection Engineers (FPE), Energy Engineers, LEED Accredited Professionals and our Commissioning Services Professionals on staff, ONE provides our clients with the highest quality of engineering services.


In 1922, Charles Foster, as sole proprietor, established his professional engineering company in Duluth, Minnesota. In 1959, Principals Howard Jacobs and Philip Johnson incorporated it under the former name of Foster, Jacobs & Johnson, Inc. (FJJ).  In 2015, FJJ merged with MEP engineering firm Obermiller Nelson Engineering (ONE) which was founded in 1992.  In 2022, Obernel announced it was merging with CMTA.


Collectively, we are a well-established, professional engineering firm rich in resources and dedicated to providing quality consulting and program management and construction management services to each market we serve. Our clients receive the full attention of professional, knowledgeable engineers through every phase of their projects.