About Us

Tsiouvaras Simmons Holderness (TSH) is a Colorado-based firm founded in 2005 and acquired by RS&H, Inc. in 2018. TSH serves the Colorado Transportation Industry and works exclusively in Colorado on transportation projects providing bridge, highway, traffic, hydraulic design, and construction management services. Over the past 12 years, TSH has earned a reputation as a leader in the industry resulting from the successful completion of many complex projects. Our approach is to provide responsive, innovative, and high-quality services coupled with a commitment from our firm leadership and associates to produce projects that meet a high standard and that will serve the best interest of the public. Our clients include the Colorado Department of Transportation, local cities, counties, municipal districts, transit agencies, and airports. Our employees are our most valuable asset. As a team, we make client satisfaction the firm’s top priority. Tsiouvaras Simmons Holderness offices are located in the Denver Tech Center, Loveland, and Colorado Springs. RS&H provides fully integrated architecture, engineering, and consulting services to help clients realize their most complex facility and infrastructure projects for land, air, and space. With a tradition that began in 1941, RS&H has helped pioneers build the launch platforms for the national space program, create global airports that connect communities, shape progressive highway systems across the country, and provide facilities for Fortune 100 companies. We continue to build on this long history of market-based, specialized experience, delivering time-tested insights to clients in Aerospace, Aviation, Corporate, Defense, Health & Science, and Transportation.

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