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Yerkes has 25 years of extensive project management and design experience on a wide range of large and complex water infrastructure projects and long-term programs. He most recently served as Vice President at HBK Engineering where he was responsible for overall leadership, management, and business development for the firm's Infrastructure Sector. He previously served as Chief of Infrastructure and First Deputy Procurement Officer for the City of Chicago, and also served as City Engineer for San Antonio, Texas.

In the role of Executive Vice President of Western Operations, Yerkes will oversee Greeley and Hansen's Southwest Operating Group, Pacific Coast Operating Group, and Construction Engineering and Management Group, along with directing the operations of the Midwest Operating Group.