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.
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.
© 2025 Harrison Western
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 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.
As Manager of Preconstruction, Jason is responsible for overseeing day-to-day business across Harrison Western and UIT, including assistance in bidding and project evaluation, marketing and business development, project management and execution and closeout of projects. Jason has extensive experience with various geotechnical construction methods including ground anchors, micropiles, rockfall mitigation, jet, compaction, slurry and cement grouting. He also has extensive experience engaging in design/build projects helping to value-engineer projects benefitting all stakeholders.
