about us

leadership team

Harmsen's engineering team is dedicated to providing designs that respect the environment while fulfilling project requirements, meeting deadlines, and providing customer satisfaction. Our services span projects from single family residences to new high schools, residential plats to industrial parks, and multifamily to commercial centers. Our work spans the public and private sectors which includes cities, counties, utility, school, and fire districts, as well as publicly funded low income housing projects.

Design services include grading, Surface Water Pollution Prevention Plans (SWPPP), wet utility mains and services (water, sewer), storm drainage control, paving & paving maintenance, roadway plan and profile, and frontage improvements. Our goal is to provide owners with successful projects, Architects with on-time delivery, and Contractors with constructable plans. We are ready for your project needs!

Doug is a licensed Professional Land Surveyor in Washington State.  Aside from performing his executive duties, he specializes in topographic mapping, ALTA/ACSM surveys, legal descriptions, and Right-of-Way surveys. He graduated from Calvin College in 1976 with a Bachelor of Arts degree in Criminal Justice, and continued his education with additional course work in surveying, environmental studies, and architecture.

Doug served on the Government Affairs Committee of the AGC of Washington for 5 years, the Government Affairs Committee of Skagit & Island County Builders Association (SICBA) for 3 years, and served 2 terms as President of the Monroe Chamber of Commerce. Doug is currently a member of Housing Hope’s East County Board of Directors.

Doug Slager, PLS
Chief Executive Officer

Karen grew up in a surveying and civil engineering family, which laid the foundation for a successful career in the industry.  Prior to joining the team at ASPI, Karen was with Harmsen and later Terrane (formerly GeoDimensions).  Her project management skills put an emphasis on customer service through organized, detail-oriented problem solving. Beginning with the initial scope development, her communication throughout the process to final product delivery ensures a successful outcome that meets project needs and exceeds client expectations.  Karen works side-by-side with surveyors, engineers, and planners to make sure every project runs smoothly and efficiently. As twelfth of fifteen kids in an Irish family, she’s learned to be creative with resources to find success.

Karen Swift
Chief Operating Officer

David is a licensed Professional Engineer in the State of Washington.  He started with Harmsen in 1985 as a survey field crew member while pursuing his Civil Engineering degree at the University of Washington.  Upon graduation, he became a full time engineer, going on to specialize in design for stormwater management systems, and roadway and grading design.

David oversees all aspects of engineering at Harmsen, and is particularly experienced in delivering successful education projects, such as new school facilities, occupied rebuilds and expansions, and pavement evaluation and rehabilitation.  He also has extensive experience with housing projects, from single family to large multi-family, as well as the full range of commercial and industrial projects.

David Harmsen, PE
President, Director of Engineering

Michael is a licensed Professional Engineer in the State of Washington. He obtained his Civil Engineering degree from the University of Washington and became licensed in 1994.  He joined us in 2012 when his firm, HBA Design Group, LLC, merged with Harmsen. Michael oversees the Oak Harbor office.  His current focus is on land development including roads, site utilities, water, and sanitary sewer and stormwater management and control. His experience includes complex rule sets with multiple jurisdictions working on roads, highways, interchanges, parking lots,  tarmacs, taxiways and runways, parking garages (geometry), drive aisles, alleys, and blacktop or concrete for large commercial vehicles.

Michael Ryan, PE

Aaron began working in construction shortly after getting out of the Marine Corps in 1996. During this time he worked mainly in road and utility infrastructure as a laborer and working his way up to a Site Foreman. In 2005, Aaron decided to put his construction experience to use as a Land Surveyor. Since making the transition to surveying, he has worked both in the field as well as the office, and obtained his PLS in 2015. His experience includes conducting research, performing boundary and topographic surveys, ALTA surveys, construction staking, and as-built surveys. Aaron’s positive attitude and solid work ethic have made him a valuable asset to our team.

Aaron Tyson, PLS
Director of Surveying