Engineering - Surveying - Mapping - Planning - Consulting
Zumwalt-Hansen & Associates Inc.
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
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
California Professional Land Surveyor since 2006
CA - PLS 8167
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
Professional Engineer in Civil Engineering since 2001 CA – RCE 61523
State of California QSD
James F. Hansen
V.P. Surveying Division
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.
California Professional Land Surveyor since 1977
CA - PLS 4375
John A. Zumwalt
President & CEO
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 Engineer in Civil Engineering since 1972
CA - RCE 21489