Engineering  - Surveying  -  Mapping  -  Planning  -  Consulting

The firm was founded in 1949 by C.J. McKee, and was reorganized in 1973 under the name of McKee-Zumwalt & Associates. In 1984, the firm took its present name of Zumwalt-Hansen & Associates, Inc. Headquarterd in Hanford, the firm serves clients throughout the Central Valley and the state. We provide civil engineering, surveying and planning services to individuals, corporations, private land developers, public agencies and other professionals.


WE ARE PROUD OF THE FACT THAT FOUR OF OUR NINE EMPLOYEES AT ZUMWALT-HANSEN SERVED IN THE ARMED FORCES OF THE UNITED STATES OF AMERICA AND ONE EMPLYOEE HAS A SIBLING CURRENTLY ON ACTIVE DUTY

Ron G. Roselius

Land Surveyor

PLS 8167


Education

  •  1970 – College of Sequoias  
  • Attended various seminars and workshops for continued education


Professional Experience
Mr. Roselius has been employed with Zumwalt Hansen & Associates continuously since 1975.  He has over 39 years of experience in land surveying, including serving 28 years as a survey party chief, and 8 years as a Professional Land Surveyor.    Mr. Roselius directs the surveying operations of the firm as well as assisting in the supervision of the office technical staff

Professional Membership

  • American Council Engineering Companies
  • California Land Surveyors Association
  • American Congress of Surveying & Mapping


Registration

California Professional Land Surveyor since 2006

CA - PLS 8167

Alex Dwiggins

Civil Engineer

RCE 61523


Education  

  • 1997 – CSU Fresno, School of Engineering
  • Attended various seminars and workshops for continued education


Professional Experience
Mr. Dwiggins has been employed with Zumwalt Hansen & Associates continuously since 1998.  He has over 16 years of experience in Civil Engineering.    Mr. Dwiggins is directly associated with the planning, design, and preparation of land development projects.  Projects include singe and multi family residential developments, commercial developments, municipal infrastructure, and other engineering studies.  Mr. Dwiggins also directs office technical staff associated with his projects.


Professional Organizations/Community Involvement

  • American Council Engineering Companies
  • City of Hanford Parking and Traffic Commission


Registration

Professional Engineer in Civil Engineering since 2001 CA – RCE 61523

State of California QSD

James F. Hansen

V.P. Surveying Division

PLS 4375


Education

  • 1959 - William Hood Dunwoody Industrial Institute, Minneapolis, Minnesota
    -Course of Study: Survey and Construction Design
  • Attended numerous seminars and workshops for continuing education


Professional Experience
Over 50 years of experience in land surveying.  Includes serving 17 years as a survey party chief, 12 years as an engineering survey technician, and 32 years as a Professional Land Surveyor.  Mr. Hansen has been a Principal in the firm since 1977.  He provides oversight for all surveying functions.

Professional Organizations

  • American Council Engineering Companies
  • California Land Surveyors Association
  • American Congress of Surveying & Mapping
  • Hanford Chamber of Commerce Director – serving 6 years
  • Rotarian – since January, 1986


Registration

California Professional Land Surveyor since 1977

CA - PLS 4375

John A. Zumwalt

President & CEO

RCE 21489


Education

  • California State university, Fresno, CA
  • B.S. in Civil Engineering, 1970


Professional Experience
Over 45 years of experience in Civil Engineering and Land Surveying.   Mr. Zumwalt was employed by Kings County Public Works Department from 1962 to 1973, the last 4 years in the capacity of Deputy County Surveyor.  Since 1973, Mr. Zumwalt has been in private practice as President of Zumwalt-Hansen & Associates, Inc., a Civil Engineering and Land Surveying firm.  Private practice experience includes a wide variety of Civil Engineering and Land Surveying projects for cities, counties, and community service districts, Industry, retail and residential developments, Ag interests and the general public.  Mr. Zumwalt is the President and CEO of the firm.

Professional Organizations

  • American Council of Engineering Companies -Served as President of Sequoia Chapter and of San Joaquin Valley Chapter. Served as State chairman of legislative committee from 1996 to present.


Registration

Professional Engineer in Civil Engineering since 1972

CA - RCE 21489


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582-1056