Sigmund A. Freeman

Senior Principal


Sigmund Freeman is a recognized expert in seismic design and analysis. Throughout his career, he has been deeply involved in the development of seismic design provisions for both structural and nonstructural systems. He developed the capacity spectrum method for predicting damage to buildings subjected to earthquake ground motion. Mr. Freeman also developed earthquake design provisions for the U.S. Army that were subsequently adopted by the Uniform Building Code. He has authored more than eighty technical papers and presented lectures on various aspects of earthquake engineering.

Mr. Freeman has worked on a variety of seismic design projects, including high- and low-rise structures and structural systems of steel, reinforced concrete, and reinforced masonry. He conducted investigations on existing buildings following the Alaska (1964), San Fernando (1971), Loma Prieta (1989), and Northridge (1994) earthquakes.

Mr. Freeman has also participated in several Applied Technology Council (ATC) and U.S./Japan cooperative projects on seismic design and structural evaluation


Peer Review

  • Oakland City Hall - Oakland, CA: Seismic upgrade using base isolation retrofit
  • San Francisco City Hall - San Francisco, CA: Seismic upgrade using base isolation retrofit
  • HP Pavilion - San Jose, CA: Peer review for new construction


Seismic Performance Evaluation

  • Alcatraz Cellhouse - San Francisco, CA: Seismic study of historic cellhouse
  • Pacific Bell Building - Oakland, CA: Seismic retrofit of high-rise commercial building annex
  • U.S. Department of State - Various Locations Worldwide: Seismicity studies


Repair and Rehabilitation Design

  • Clorox Office Building - Oakland, CA
  • Watergate Condominiums - Emeryville, CA
  • Congregation Sherith Israel - San Francisco, CA
Professional Affiliations

American Concrete Institute
American Society of Civil Engineers
Applied Technology Council
Earthquake Engineering Research Institute
Seismological Society of America


Civil Engineer in CA
Structural Engineer in CA


University of California, Berkeley
Bachelor of Science, Civil Engineering, 1955
Master of Science, Civil Engineering, 1957