Company Profile
Design Excellence | Collaboration | Innovation | Sustainability

These are the principles that YEI Engineering was founded upon when established in 1975. Headquartered in Oakland, with branch offices in San Francisco and San Jose, YEI specializes in mechanical, electrical, and plumbing engineering for municipal, institutional, commercial, educational, and federal projects.

We pride ourselves on being excellent listeners and being highly responsive to our clients’ needs. We believe this is accomplished through senior level involvement on all our projects. YEI produces creative and cost effective engineering solutions with on time delivery. We offer flexible designs to enhance usable space and to provide support during the construction administration phase. While we are a small business entity, we bring the project expertise and experience of a larger firm to bear on every job.


Moon H. Yuen, P.E., an Electrical Engineer, formed Yuen's Engineering Company as a sole proprietorship in August of 1975 in San Francisco, CA. Prior to founding his own company, Moon worked for Bechtel for twenty-seven years where he completed hundreds of design engineering projects. Some of his work was summarized in eighteen important technical papers including the low voltage heating of motors for which he was awarded a U.S. patent. "Short Circuit ABC," the most well-known of his technical papers was published in 1973. Throughout his professional career, Moon was a dedicated educator. He organized and taught numerous seminars and classes, which included the powerful MVA method. In 1991, Moon was elected a Fellow of the Institute of Electrical and Electronic Engineers (IEEE) and was recognized for his "contributions to electrical distribution system analyses and synthesis including the development of simplified methods of determining system transient conditions".

In October of 1975, Moon hired Weston Fenner, P.E. and in January of 1976, the two engineers formed a partnership called Yuen-Fenner and Associates. In August of 1977 the partnership was dissolved in favor of the corporation and became Yuen-Fenner, Inc. In October of 1977, Douglas Yung, P.E., formerly with PG&E and Bechtel, was invited to join the firm as a Director.

Throughout the next several years the firm continued to grow, performing all electrical engineering on contracts and utilizing the services of subconsultants for mechanical, structural, civil, and architectural engineering as required. The firm provided services to clients in California, Oregon, Washington, Arizona, New Mexico, Texas, Alaska, Korea, Saudi Arabia, and Canada.

In March of 1980, both electrical and mechanical engineering services were offered with the addition of Harding Jung, P.E., Mechanical Engineer to the firm. In 1981, the company relocated its headquarter to Hayward, CA making the San Francisco location a branch office. With the departure of Weston Fenner from the firm in 1983, the former corporate name of Yuen-Fenner, Inc. was changed to YEI Engineers, Inc. (YEI) in March 1984.

In 1988, YEI’s Board of Directors, in recognition of Moon's desire to retire, elected Douglas Yung as President and Chief Operations Officer. Two years later, the Board elected Moon as Chairman Emeritus and Douglas Yung as Chairman of the Board, President, and Chief Executive Officer.

Today, the firm is headquartered in Oakland, with branch offices in San Francisco and San Jose. The firm has over 20 electrical, mechanical, technical, and administrative staff professionals. In addition, over 30 technical papers and articles have been written and published by our engineers in professional publications, trade magazines, and technical journals.

YEI continues to provide reliable, practical, and high quality MEP engineering design services.

YEI's Certifications
  • Alameda County Transportation Commission (ACTA/ACTIA) - LBE and SLBE
  • County of Alameda – General Services Agency - SLBE under the SLEB Program, Certificate # : 02-89976
  • State of California – Department of General Service – SBE, Certificate # :18641
  • California Unified Certification Program (Caltrans) – DBE, SMBE, Certificate # : 1807
  • Western Regional Minority Supplier Development Council (WRMSDC) - MBE, Certificate # : WR02261
  • City of Oakland – SLBE, Certificate # : 2223
  • Port of Oakland – LIABE, SBE, Certificate # : 221304
  • Supplier Clearing House (California Public Utilities Commission) – MBE, Certificate # : 95BN0026
Professional Recognition

San Francisco Association of Civil Engineers (ASCE)
"2016 Transportation Project of the Year" for Mission Blvd/Warren Ave/Freight Railroad Relocation Program

Chinese American Institute of Engineers and Scientists
"Meritorious Service Award" and 2012 Keynote Speaker for Annual Scholarship Award Event.

Sacramento Regional Transit District
"2006 Certificate of Recognition" for Amtrak-Folsom Extension Corridor Light Rail Project.

Air Mobility Command, Scotts Air Force Base
"2003 Air Mobility Command Design Awards Program" for the Western Acoustical Support Facility at Travis Air Force Base, California.

American Society of Civil Engineering
"Outstanding Civil Engineering Award” for Construction of Berth 55 and 56 Container Yard, Port of Oakland.

Department of the Navy, Engineering Field Activity, West
"Certificate of Appreciation" for the design of the BRAC (Base Realignment and Closure) Electrical Distribution project at Travis Air Force Base, Fairfield, CA.

San Francisco State University
"Certificate of Appreciation" for contribution to the building of the Power Testing Laboratory.

Asian-American Architects and Engineers
1985 Distinguished Achievement in Engineering
1989 Distinguished Achievement in Engineering

Institute of Electrical and Electronic Engineers
1884-1984 "Centennial Medal Award."

Sustainability and Achievements

Platinum LEED Certification
UC Davis/Sierra Nevada College - Tahoe Center for Environmental Science Laboratory Building
NAVFAC SW - MCAS Miramar Human Resources Center
NAVFAC SW - Luke Air Force Base NOSC Facility

Gold LEED Certification
NAVFAC SW – Camp Pendleton Dining Facilities

Silver LEED Certification
Muni Islais Creek Maintenance & Operations Facility Phase II – San Francisco, CA
Oakland International Airport Terminal 2 Expansion Project
Acute Tower Replacement and New Satellite Building Highland Hospital - Oakland, CA
390 Main Street Renovation Project Bay Area Headquarters Authority (BAHA) - San Francisco, California
Modernization and New Construction Anne Darling Elementary School - San Jose, CA
City of Oakland – Golden Gate Recreation Center

2013 Preservation Design
Port of San Francisco, Pier 29 Fire Reconstruction Project

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