YEI Engineers, Inc. ( YEI ) has provided electrical and mechanical engineering services to both public and private sectors since 1975. YEI also provides architectural, civil and environmental engineering through subconsultants. YEI is a certified Minority Business Enterprise ( MBE ) and a Small Disadvantaged Business Enterprise ( SDBE ). Please make a selection from the menu at the top to view some of our completed projects or to learn more about our company and our engineers.
Simpson Gumpertz & Heger (SGH) designs, investigates, and rehabilitates constructed works in the United States, Canada, and in more than thirty additional countries. SGH's work encompasses building, energy, civil & infrastructure, and science & defense projects .
Dowling Associates, Inc is a traffic engineering and transportation planning consulting firm based in Oakland, California with offices in the Central Valley and Sacramento. Founded in 1986, we currently employ over 40 full-time professional and support staff. Our clients include the Federal Highway Administration, the National Academy of Sciences, Caltrans, Florida DOT, the University of California, plus numerous cities, counties, and metropolitan planning organizations.The diverse experience and training of our key personnel are the strengths of Dowling Associates. Principals are actively involved in the Transportation Research Board and the Institute of Transportation Engineers. Seven of the staff are certified civil engineers, seven are certified traffic engineers and five are AICP/PTP certified planners. Our principals also teach university courses and participate in significant government research projects.
