ROBERT B. BITTNER, P.E., P.Eng. - President
Mr. Bittner is a professional engineer with 46 years of experience in construction engineering and project management on major marine construction projects worldwide. The focus of Mr. Bittner's work has been on minimizing construction costs through the design and development of innovative methods and equipment for marine construction projects. These innovative methods and equipment have been employed on the construction of major bridges, immersed tube tunnels, ocean outfalls and intakes, marine terminals, offshore structures, locks and dams world wide. (More...)
TOM PETRAY, P.E. - Chief Engineer
Mr. Petray has 20 years of experience in Structural Engineering and Design including construction engineering, building design, and bridge design. He has extensive experience in the design of temporary structures including cofferdams, bridge falsework and formwork, overwater construction platforms, floating platforms, heavy lifting devices, and access trestles. His design work has been used in the construction of buildings, water intake facilities, floodgates, bridges and other marine structures. Mr. Petray's work has been done with an emphasis on integrated design and construction, providing innovative designs which increase contractor safety, productivity and overall job performance while reducing cost. (More...)
WENJUN DONG, Ph.D., P.E. - Chief Geotechnical Engineer
Dr. Dong has academic background and professional experience in geotechnical, coastal and structural engineering as well as surface/subsurface groundwater transport problems. He has extensive experience in geotechnical engineering design of marine foundations and retention structures, and analyses of slope stability, seepage and consolidation settlement, static and dynamic pile analyses. He has performed finite element soil-structure-interaction analysis for the performance-based designs of major civil engineering structures, such as IHNC Strom Surge Barrier in New Orleans, Louisiana. Dr. Dong has performed geotechnical earthquake engineering analysis including seismic hazard and site response analyses, assessments of liquefaction of loose sand, and post-earthquake settlement of soft clay. Dr. Dong's professional focus has been on reliability-based design of marine foundations, soil-pile-interaction, ground water flow with multi-physical processes. (More...)


NORM KIRK, P.E. - Senior Construction Engineer
Mr. Kirk has 38 years experience in heavy civil construction and structural engineering. His experience includes tunnel and bridge construction, as well as building construction and structural design. Responsibilities have included supervisory engineering at the corporate level for the planning of construction work methods, design of temporary structures and construction engineering support for field operations and estimating teams. Mr. Kirk's construction engineering experience has included development of bridge erection methods, design of cofferdams, bridge falsework, and bridge erection equipment. His construction engineering has also included erection engineering and heavy rigging for steel and concrete structures. Mr. Kirk is currently assisting contractor clients with work methods, job startup, and general engineering design issues. Projects of note include design of the precast concrete cofferdams for the main towers of new cable-stay Audubon Bridge across the Mississippi River at St. Francisville, Mississippi.

EDWARD WORTMAN, P.E. - Senior Construction Engineer
Mr. Wortman has over 42 years experience in the design and erection of major steel structures including long span bridges, offshore platforms, and high rise buildings. His projects have included:
  • Project Field Engineer on the Fremont Bridge across the Willamette River in Portland, Oregon - world's longest tied arch at the time with a 1,255-foot main span. Mr. Wortman supervised planning and erection of the offsite assembly, float-in and 160-ft lift of the 900-ft, 6,000-ton tied arch center span - the world-record bridge lift at the time.
  • Project Engineer for the float-in and erection of the 516-ft double track 4,000-ton lift span of the BNSF Railroad Bridge across the Willamette River at Portland, Oregon.
  • Senior Supervising Engineer for Multnomah County for the erection and float-in of the new 360-ft tied arch span for the new Sauvie Island Bridge at Portland, Oregon..

  • MARC GERIN, Ph.D, P.E. - Senior Structural Engineer
    Mr. Gerin combines extensive experience in the analysis and design of marine structures and bridges with a specialization in seismic analysis, design and retrofit. He has provided design expertise for unique marine structures such as the Hibernia offshore oil platform, a float-in submerged structure for the Rocky Reach Dam, and concept development for an offshore LNG facility located in arctic waters. His seismic expertise has been used on the retrofit of the Pattullo bridge, a major Vancouver bridge built in 1938, and the conceptual design of the Knik Arm bridge located in a Magnitude-9 earthquake zone.

    Home Office: 921 SW Washington Street, Suite 765, Portland, OR 97205 Tel: 503.766.3199 Fax: 503.922.0105
    Denver Office: 2851 S Parker Road, Suite 424, Aurora, CO 80014 Tel: 720.287.0364