an American-owned and operated Heavy Civil, Tunneling and Mining Contractor in operation since 1968. Our work takes us from coast to coast and includes mining development, heavy civil construction, tunneling and geo-construction.

True to our history, we seek those projects that challenge the conventional and encourage innovation and creativity by our teams to deliver optimal outcomes. Whether large or small, our teams tackle projects with an intensity upon which Harrison Western has built an international reputation.


With more than five decades of experience serving the Mining/Heavy Civil Industries, we continue to prioritize building relationships with clients and partners which deliver results that exceed expectations. We have completed projects in dozens of countries totaling in excess of $2.5 billion, and the company has consistently delivered in some of the most complex, challenging environments with work including record-setting accomplishments.

50+ years of experience

Over $2.5 billion in completed projects

Projects in dozens of countries

Diverse history of project types


Harrison Western has helped to pioneer Alternative Project Delivery over the past several decades. We are well-versed in Design/Build and Early Contractor Involvement (ECI) approaches, both of which are highly collaborative ways to take problem-solving and innovation to the next level. Through single-source responsibility and uniting the entire process from planning to design and through to execution, we have the best system to help manage cost, increase value, and streamline project scopes and schedule — ultimately delivering a higher quality outcome.


Harrison Western is a firm wholly committed to delivering our projects in a safe, compliant, and environmentally responsible fashion. We value a culture of empowerment across our organization as it relates to our safety performance and employ proven initiatives that encourage individuals to actively influence safety performance, compliance, and constant improvement.



P.E., D.GE
Vice President

Director of Marketing & Business Development

Joe Diesslin


As President of UIT and our parent company Harrison Western Construction, Joe is responsible for overall leadership and direction for the firm including administrative management, business development, field operations, engineering, safety, maintenance, and MSHA/OSHA compliance. Mr. Diesslin’s extensive geotechnical background and diverse experience compliments the wide variety of scopes and methods employed at UIT very well. Joe is the named party for contracting licenses in eight states, as well as most Colorado counties and municipalities that require licensing.

Tom Szynakiewicz, PE, DGE

Vice President

Tom has more than 16 years of management experience in the specialty construction industry, primarily focusing on the geotechnical construction sector. His expertise includes earth retention, landslide stabilization, and ground improvement. Tom has employed a wide variety of geotechnical construction methods including ground anchors, micropiles, wet and dry soil mixing, vibro-compaction and stone columns, jet grouting, and compaction, slurry, cement, and chemical grouting. Tom is a licensed professional engineer in 18 states and is a certified Diplomate Geotechnical Engineer by the ASCE Academy of Geo-Professionals. He has previously served on the Board of Directors of the Rocky Mountain Chapter of the International Association of Foundation Drilling and is past President of the Colorado Association of Geotechnical Engineers.

Scott Teel

Director, Business Development & Marketing

Scott’s professional career spans over two decades of working to build brands, implement strategic sales teams, market nationally recognized B2B service providers and create national award-winning campaigns. In his role as Director of Marketing and Business Development at UIT, Scott brings energy, and a true passion to the organization’s business development practices. In his community, Scott has served as Chairperson of the Greater Charlotte Purple Heart Dinner, Executive Board Member of the Charlotte Home Builders Association and Judge for the National Housing Quality Award. He has also performed as a Disaster Action Team leader with the American Red Cross.

David DePaco

Chief Estimator

David is a 28-year veteran of the heavy construction industry, with an extensive academic background in Civil Engineering and diverse project management and executive leadership roles for over two decades. His focus at UIT involves oversight for all estimating and budgeting operations. In addition to his role in leading and managing the full estimating team, he is heavily involved in individual project planning and scheduling, vendor vetting/relations and pricing elements as well as coordination of tasks that culminate in all pre-deployment customer interactions. He also serves as a key member of the Senior Leadership Team helping to ensure strong communication and collaboration between Business Development, Estimating and Operations.