New Principals of the Firm

Psomas is pleased to announce the appointments of Ann Johnston and Andrew Nickerson as Principals of the Firm.


Psomas’ Resource Management Team Leader, Ann Johnston focuses on finding solutions to project challenges due to their potential impact on natural resources. She specializes in the assessment and integration of biological data into environmental documentation in compliance with state and federal environmental laws and regulations. Ann has 27 years of experience in Southern California providing clients with biological resources inventories/evaluations; sensitive species surveys; mitigation monitoring; resource agency permitting and processing; and conservation and strategic planning services.

A graduate of California State University, Long Beach, with a degree in biology, Ann is a member of the Women’s Transportation Seminar and The California Native Plant Society. She is based in Psomas’ Orange County office.


Andrew Nickerson, PE, QSD, ENV SP has 20 years of experience providing civil engineering design of public transportation infrastructure and private residential, commercial, and institutional (correctional, justice, medical) facilities. Andrew’s expertise spans project management, technical environmental impact report preparation, grading, utility design, hydrology and hydraulic studies/reports, geometric road design, engineering research/reports, and quantity/cost estimate preparation.

A graduate of Holy Cross College and Columbia University, Andrew also holds a master’s in civil engineering from University of California, Irvine. He is a State Director and Past President of the Los Angeles County Chapter of the American Council of Engineering Companies, Board Member of the Los Angeles Headquarters Association, and a member of the American Society of Civil Engineers. He also serves on the County of Los Angeles Environmental Review Board. Nickerson is based in Psomas’ Los Angeles office.




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