Timothy Der

Principal Advisor, Acoustics

Bay Area

Meet Tim

Tim is a principal advisor in Coffman’s Bay Area office. He joined Coffman in July 2023 as part of the asset purchase agreement with RGD Acoustics.

Tim has many years of acoustical consulting experience and specializes in architectural acoustics and noise and vibration attenuation of mechanical systems. His engineering skills and experience are applied to a broad range of projects including educational, medical and research facilities, offices, mixed use residential, and entertainment spaces including performance and production, and airport noise studies. He has extensive experience in troubleshooting acoustical problems, performing acoustical testing in the field and developing detailed designs to solve complex noise issues.


  • Institute of Noise Control Engineering (INCE), Board Certified #18003


  • ACOUSTICS: Architecture, Engineering, the Environment, William Stout Publisher, 1998 (co-author)