| About the Speakers: Justin Lewis, P.E. (IL) is a graduate of the University of Illinois at Urbana-Champaign with a B.S. (2007) and M.S. (2008) in Civil and Environmental Engineering with a focus on geotechnical engineering. Mr. Lewis has worked at Keller for 15+ years after joining upon completion of his degrees in 2008. He has worked with a wide variety of technologies with particular experience in the fields of jet grouting, earth retention, micropiles, and driven piles. Mr. Lewis has previously held roles as Field Engineer, Project Engineer, Project Manager, Division Manager, and Project Executive at Keller and currently serves as Branch Manager for the Great Lakes Branch in the Midwest with responsibilities for managing and supporting a talented team bidding, designing, and managing geotechnical construction projects. Particular areas of expertise and/or experience: Jet grouting (structural/bottom seal), Sheet Piling, Soldier Beams and Lagging, Secant/Tangent Piles, Internal Bracing, Tiebacks, Driven Piles, and Micropiles.
Bill Lederer started out as a project manager in the deep foundation industry more than 40 years ago working at Case Foundation Company, which was acquired by the Keller Group in 1994. Bill has managed more than 150 projects during his career including some of the tallest and most complex buildings in the Midwest. Bill’s portfolio of projects includes the 77-story One Chicago Square, a mixed-use development with two towers occupying a city block; the 101-story Wanda Vista Tower now known as the St. Regis, Chicago’s third tallest building with an intricate tower design; and the 92-story Trump International Hotel and Tower, Chicago’s second tallest building and one of the tallest reinforced concrete buildings in the world. Other projects include the Clinch River Bridge in Knoxville, the Hurricane Deck Bridge in Lake of the Ozarks, and the 60-story Salesforce Tower in Chicago. Bill is a graduate of Purdue University with a Bachelor of Science degree in Building Construction and Contracting.
Darren Diehm is a Senior Consultant in the Chicago office of GEI Consultants. He is a specialist in design and analysis of foundations and deep excavations for urban environments. He has extensive experience in hi-rise and stadium construction; underpinning and retaining walls; and marine construction including coastal revetments, piers, wharves and cellular cofferdams. He has performed geotechnical studies and investigations for transport and infrastructure projects including rail, highways, bridges, dams and levees. In addition to widespread US experience, he has worked overseas in Australia, New Zealand, Qatar, and Dubai. |
