Learn about our Team and Culture

Mark has been the principal air quality scientist on the Owens Lake Dust Mitigation Project (OLDMP) for the Los Angeles Department of Water and Power (LADWP) since 1997. From 2006 to the present, he has served as Program Manager and science advisor on a $30 million+ Owens Lake Science, Technology, and Regulatory contract for the LADWP.

Prior to 1997, Dr. Schaaf was the Program Manager on a multi-million dollar contract to provide nationwide air quality services to the USDA Forest Service and other federal land management agencies. He was the principal investigator on dozens of air quality impact reports and models, and was lead instructor on training courses across the West.

Mark is a leading air quality expert and author of reports and scientific publications dealing with fugitive dust emissions monitoring and modeling, wildland fire behavior and smoke emissions modeling, landscape-scale fire effects tradeoff analysis, and micrometeorology. His early experience was as a firefighter, timber cruiser, and sawmill worker around Oregon.

His technical expertise covers emission permitting and compliance for industrial sources, AERMOD analysis review and results interpretation, air quality impact assessment and mitigation under NEPA, and tribal air quality program development. Among his specialties are presentation and communication of technical and regulatory information.

Dave has developed technical products and decision-support tools for the Western Regional Air Partnership to improve quantification and management of fire emissions in the US. Regional emission inventory development, determining practices for refining fire activity, and supporting regulators to manage smoke are his areas of expertise.

Dave provides subcontract management and regulatory support to large Air Sciences projects (including the Owens Lake Project). The most rewarding aspect of his job at Air Sciences is building relationships with colleagues and clients in order to work on and solve the air quality-related challenges we encounter.

Elizabeth has developed emission inventories for industrial sources, including estimating criteria and hazardous air pollutant emissions from fugitive dust, combustion sources, and mining processes. She has completed numerous permit applications and analyses, including environmental impact analyses for complex sources.

She has consulted with the Nevada Mining Association (NvMA) in the development and implementation of the Nevada Mercury Control Program and the Federal Mercury MACT. This included preparing technical documents on behalf of the NvMA addressing mercury air emissions and mercury control technologies.

This work culminated in the permitting of existing, new, and modified mercury sources. Elizabeth has provided GIS support for numerous air dispersion modeling applications, siting studies, and environmental assessments. In addition to her consulting work, Elizabeth also serves as Air Sciences’ Corporate Treasurer.

He is a certified senior ecologist and has been published in a variety of scientific papers and presentations. His expertise in air quality includes developing emission inventories, developing and implementing data analysis methodologies, modeling of atmospheric dispersion and chemistry, and conducting environmental compliance analyses.

Maarten has developed air quality compliance methods for ozone and carbon monoxide for the Czech Hydrometeorological Institute in Prague, Czech Republic, the Czech national equivalent of the EPA. He is experienced in evaluating fugitive dust emissions through data analyses, field studies and modeling.

The focus of his work in this area has been on the quantification of particulate matter emissions from desert playas and other desert soils, the associated air quality impacts, the development and field testing of mitigation measures, and the evaluation of these measures in the context of air quality compliance regulations.

Ejaz is experienced in criteria and hazardous air pollutant analyses and emission calculations, emissions inventories development, and air permitting and compliance monitoring. He manages permitting projects including proposal writing, project strategy development, cost estimation, and interaction with regulators.

He has provided complete air compliance management services to clients by developing and implementing methods to ensure timely source compliance with applicable federal, state, and regional air pollution control programs. Ejaz is well acquainted with a variety of regulatory and third-party software suites used in support of air quality consulting work.

His knowledge of modeling suites includes EPA’s AggreGATOR, ArcHydroTools, and AERMOD modeling system, and graphic and GIS applications like AUTOCAD, SURFER, and Arc View. Ejaz also oversees and manages the support operations and staff at Air Sciences Inc. as administrative manager.

Joel provided comprehensive air quality consulting services for the Barrick Cortez and Ruby Hill Mines in Nevada, among others. He prepared and submitted several permit modification applications, provided support for compliance issues, and has worked with mines and regulators on implementing new mercury control rules.

He has performed regulatory dispersion modeling analyses for various open-pit and underground mining operations in Colorado, Nevada, Arizona, and Latin America. He has also performed a PSD modeling analysis for a power generation facility, modeling analyses for oil and gas exploration projects on- and off-shore, and impacts from a chemical facility.

He has worked with mining clients on compliance tracking and reporting, and to develop compliance tracking tools. Joel’s corporate responsibilities have included managing and training several employees, operating and maintaining Air Sciences’ computer and phone networks for several years, and managing Air Sciences’ office space in Golden, CO.

Tim provides technical and regulatory air quality services to a variety of industries including oil and gas, mining, power generation, and industrial manufacturing. He is a project manager and technical lead for complex projects, including PSD permitting efforts. His work includes cost estimates and budgeting, technical work and reports, and agency negotiation.

The technical work on permitting projects has included regulatory reviews, emission inventories, BACT/control technology analyses, dispersion modeling, and health risk assessments. For a wide range of industrial facilities, Tim has conducted impact analyses using dispersion modeling for demonstration of full facility compliance.

Tim has previous state agency experience with the Arizona Department of Environmental Quality, where he was the chief permit modeler and a part time permit engineer. He was also formerly a corporate environmental engineer for a leading manufacturer of fiberglass insulation and roofing products.

John focuses on statistical analysis and modeling, experimental planning and design, and research project development and management. He has developed monitoring and alert systems, as well as automated reporting tools, which allow clients to continuously monitor their data collection performance and anticipate analysis results.

For the Owens Lake Dust Mitigation Project in California, John has designed field studies, produced final analyses of study results, interfaced with regulatory agencies, and contributed to long-term project planning. His technical experience includes extensive use of database and scripting languages, data graphics, GIS, and analysis of remote-sensing imagery.

John is also a registered Professional Civil Engineer (AK, OR, WA) with experience in civil and structural engineering design. His previous work experience includes positions as a field engineer for a major oil and gas company, and as research manager for a project to redefine structural lumber design values.