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Meet Our Team

Adrienne LaPierre, Principal and President

Practice Areas: Human Health Risk Assessment, Exposure Assessment, Toxicology, Risk Management, and Risk Communication

Ms. LaPierre has more than 20 years of experience in environmental consulting, with emphasis on toxicology and human health risk assessment. She has managed or performed multipathway risk assessments for Superfund sites, RCRA facilities, petroleum release sites, town gas sites, and various types of industrial properties. She has extensive experience in performing critical evaluations of the toxicological literature, defining dose-response relationships, establishing exposure limits, and evaluating potential causal associations between chemical exposures and documented adverse health effects.

Nicholas T. Loizeaux, P.G., Principal

Practice Areas: Brownfields Redevelopment, Site Investigation and Remediation, Geologic and Hydrogeologic Site Characterization, and Hazardous Materials/Waste Management

Mr. Loizeaux is a California professional geologist and has over 20 years of experience as a technical consultant in the fields of geology, hydrogeology, and contaminated site investigation and remediation. Most of this work has been conducted in the context of Superfund, due diligence compliance, litigation, or Brownfields redevelopment. Mr. Loizeaux has designed and implemented numerous site investigations, which have included hundreds of soil borings, monitoring well installations, monitoring well decommissionings, subsurface geophysical investigations, aquifer tests, and soil, groundwater, and soil gas sampling efforts. He has brought a number of underground and above-ground storage tank (UST/AST) cases to closure, brought a number of sites to closure, and has conducted numerous due diligence audits of manufacturing, agricultural, and commercial properties.

Todd Bernhardt, Principal

Practice Areas: Human Health Risk Assessment, Site Investigation and Characterization, Exposure Assessment, Toxicology, Risk Management, and Risk Communication

Mr. Bernhardt has more than 16 years of experience in environmental consulting, with emphasis on human health risk assessment, site investigation and characterization, vapor intrusion modeling, and toxics regulations compliance. He has managed or performed multi-pathway risk assessments for numerous properties under both federal and state regulatory programs, including power plant sites,  utility service stations, former manufactured gas plants, and naval installations, and has served as the primary client and agency point of contact for all risk-related issues for these properties. In addition, he has completed several consumer product risk assessments for Proposition 65 (California's Safe Drinking Water and Toxic Enforcement Act) compliance, and he has provided technical support for tesimony in toxics-related litigation.

Spencer Jackson, Principal

Practice Areas: Environmental Consulting, Environmental Assessments, Regulatory Compliance Audits, Transaction Advisory Services

Mr. Jackson is a Director of Transaction Advisory Services group in RPS’s Irvine CA office. In this role, Mr. Jackson’s responsibilities include business development and overseeing a wide variety of environmental projects for lenders, private equity firms, attorneys, real estate and industrial clients. Mr. Jackson has been involved in over 500 Phase I Environmental Site Assessments and compliance reviews, covering a wide variety of industrial and commercial settings in over 15 countries including projects in Europe, North and South America, Asia and Africa. Mr. Jackson’s project responsibilities include coordinating environmental due diligence work associated with portfolio deals; conducting, overseeing and reviewing various environmental reports; quantifying potential environmental liabilities; and providing technical support to legal, financial, and corporate clients during transactions.

Martin Hamann, PG, C.H.G., Principal

Practice Areas: Site Investigation and Remediation, Environmental Assessment, Litigation

Mr. Hamann is Vice President of the Site Investigation and Remediation Division for RPS Group in its Irvine, California office. He is a California professional geologist and hydrogeologist. He is responsible in establishing, implementing and delivering environmental results for governmental and non-governmental agencies, industrial clients, attorneys, financial institutions, and insurance companies. He has as a strong blend of technical, scientific, and business sense and consistently provides value on environmental matters. Mr. Hamann has over 25 years of performance and management of numerous Environmental, Health and Safety (EHS) programs, site investigations, environmental assessments, due diligence for property transactions, aquifer characterizations, and remedial actions.

John P. McLaughlin, P.E., Principal

Practice Areas: Environmental Risk, Construction Risk Management, Environmental Consulting, Human Health Risk, Ecological Risk

Mr. McLaughlin is the Senior Manager within the Tech Sector Advisory Group, and has been with RPS for almost 10 years. Mr. McLaughlin is a California professional engineer. His academic and work experience has emphasized vapor intrusion analysis, risk characterization, chemical fate and transport, air quality monitoring, air quality modeling, and emissions estimation.  Additionally, he has experience providing environmental support for real-estate transactions and redevelopment projects.  He has significant experience in developing and managing the implementation of construction risk management plans.