Managing Principals
Principals & Senior Advisors
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Steven O. Helgen
Principal, Hydrology, Geosciences, and Chemistry
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Heather Lynch, MPH, DABT
Principal, Toxicology, Health, and Ecological Science
Technical Staff
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Andrew J. Halmstad, P.E.
Senior Consultant
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Claire M. Hamaji, MPH
Consultant
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Olivia Hargrave, P.E.
Project Engineer
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Ellen Hartley
Senior Information Analyst
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Sydney Harvey
Economic Analyst
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Elizabeth Hofstetter
Senior Consultant
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Dylan Hull
Assistant Scientist
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Craig Hutchings
Senior Consultant
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Heather M. Summers
Senior Consultant