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Who We Are

Who We Are

ZMassociates is an environmental and strategic consulting firm. We specialize in Air Quality Modeling, Health Risk Assessment, Permitting, and Legal Expert services. We work with public and private clients to solve large to small scale environmental problems.
We partner with clients and stakeholders to encourage long-term sustainable solutions.

We partner with our clients to imagine, design, and create innovative strategies that increase customer satisfaction, boost sales, reduce costs, eliminate wasteful practices, mitigate risk, and protect and improve our environment and human health.

With Offices in Irvine, California, Portland, Oregon, and Europe, ZMassociates responsiveness to client needs are easily met.

Our employees enjoy their work and find solving environmental problems for our clients rewarding and fitting to their values.

Our employees include advanced degreed scientists, civil engineers, environmental engineers, toxicologist, hydrogeologist, environmental chemist, senior modellers, professional technical writers, researchers, and technical support staff.


Mr. Miller and staff have worked with Honeywell Aerospace, Lawrence Livermore National Labs, Lawrence Berkeley National Labs, Caltrans, Las Angeles METRO Transportation Authority, California High Speed Rail, Several large and small Law Firms, Nike, Starbucks, Microsoft, Intel, Fujitsu, Amgen, Genentech, ExxonMobil, Sempra Utilities, state and federal government agencies and other organizations, to solve complex environmental problems. Mr. Miller and staff have developed an approach that is unique, producing a return on investment every time. He leads a team of experts which develops client ability to solve there own challenging problems.

Our services are different from any consulting firm with which you have worked. We take great pride in offering genuine and professional solutions to each of our clients.

Thomas Miller

Thomas Miller

What our clients say . . .

  • ZMassociates prepared a successful Hazardous Waste Permit Application for California DTSC. We could not have done this work without ZMassociates. Mr. Miller and his team were amazing. We plan to use them again!
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    John Bowers, Waste Treatment Manager, Lawrence LIvermore National Laboratory

  • ZMassociates provided rapid and comprehensive support for relocation of our Hillsboro facility. They were excellent, easy to work with, and I plan to use them again.
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    Don Davis, Facilities Manager, FEI Company

  • Thomas provided excellent consulting to the Oregon Sustainability Board providing great ideas for use of the project based learning model. We are very thankful for his insight and hard work.
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    Bill Bradbury, Secretary of State, State of Oregon

  • Mr. Miller is providing Outstanding AERMOD modeling Expert Witness support for a case involving greater than 5,000 plaintiffs exposed to air emissions from a nearby Cerro Copper smelting facility. Greater than 50 years of dioxin/furan air emissions from Cerro have been shown to create sever health impacts to these plaintiff.
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    Gregory Cade, Attorney, Environmental Litigation Group, P.C.