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Organizational Chart

The Office of Environmental Health Hazard Assessment (OEHHA) is one of the six Boards, Departments, and Offices of the California Environmental Protection Agency. OEHHA's mission is to protect and enhance the health of Californians and our state's environment through scientific evaluations that inform, support and guide regulatory and other actions.

application/pdf file icon Organizational Chart Meet the Executive Office

For full listing of staff, please navigate to a section below.

Executive Office

Office of Chief Counsel

Office of External and Legislative Affairs

Proposition 65 Implementation Program

Division of Scientific Programs

Administrative Services Division

Executive Office

  • Lauren Zeise, Ph.D., Director
  • David Edwards, Ph.D., Chief Deputy Director
    • Paula Torrado Plazas, MPH, Environmental Program Manager I (Supervisory)
    • Vacant, Special Assistant
    • Vacant, Administrative Assistant II
  • Amy Gilson, Ph.D., Deputy Director, External and Legislative Affairs
  • Mike Gyurics, Deputy Director, Administrative Services
  • Vacant, Chief Counsel
  • Vacant, Deputy Director for Scientific Programs

Office of External and Legislative Affairs

  • Amy Gilson, Ph.D., Deputy Director
    • Krystyna von Henneberg, Ph.D., Associate Governmental Program Analyst
    • Allan Hirsch (Retired Annuitant), Information Officer II 
    • Nicholas Santiago, Ph.D., California Council on Science and Technology Policy Fellow

Proposition 65 Implementation Program

  • Tina Cox, Senior Environmental Scientist (Supervisory), Section Chief
    • Esther Barajas-Ochoa, Associate Governmental Program Analyst
    • Kiana Vaghefi, Environmental Scientist
    • Vacant, Senior Environmental Scientist (Specialist)

Office of Chief Counsel

  • Vacant, Chief Counsel
    • Corey Friedman, Attorney IV
    • Ryan Mahoney, Attorney III
    • Carol Monahan Cummings (Retired Annuitant), Attorney IV
    • Kristi Morioka, Attorney III
    • D. Monet Vela, Associate Governmental Program Analyst
    • Vacant, Senior Legal Analyst

Division of Scientific Programs

  • Vacant, Deputy Director
    • David Siegel, Ph.D. (Retired Annuitant), Assistant to the Deputy Director
    • Vacant, Assistant Deputy Director
      • Nancy Firchow, Senior Librarian

      • New Toxicology Evaluations Section

        • Anatoly Soshilov, Ph.D., Senior Toxicologist, Section Chief
        • Healther Bolstad, Ph.D., Staff Toxicologist (Specialist)
        • Scott Coffin, Ph.D., Research Scientist IV (Chemical Sciences)
        • C. Jennifer Hsieh,Ph.D., Staff Toxicologist (Specialist)
        • Sana Majid, Research Scientist IV (Epidemiology/Biostatistics)
        • Nuno Miguel da Silva Almeida, Ph.D., Research Scientist IV (Chemical Sciences)

      • Program Support Section

        • Brian Brown, Ph.D., Staff Services Manager I, Section Chief
        • Carolyn Flowers, Associate Governmental Program Analyst
        • Hermelinda Jimenez, Management Services Technician
        • E. Sylvie Lee, Associate Governmental Program Analyst
        • Colin Meinrath, Office Technician (Typing)
        • Vacant, Office Technician (Typing)

    Air and Site Assessment and Climate Indicators Branch (ASACIB)

    Kannan Krishnan, Ph.D., Supervising Toxicologist (Managerial), Branch Chief

    • Air Toxicology and Risk Assessment Section

      • Rima Woods, Ph.D., Senior Toxicologist, Section Chief
      • Nygerma Dangleben, Ph.D., Staff Toxicologist (Specialist)
      • Daryn Dodge, Ph.D., Staff Toxicologist (Specialist)
      • Mark Miller, M.D., M.P.M., Public Health Medical Officer III
      • Priyanka Saxena, M.D., Public Health Medical Officer II
      • Rona Silva, Ph.D., Staff Toxicologist (Specialist)
      • Moira Sullivan, M.S., Associate Toxicologist
      • A. Albert Wang, Ph.D., Staff Toxicologist (Specialist)
      • Ola Wasel, Ph.D., Associate Toxicologist
      • Jianming Yang, Ph.D., Staff Toxicologist (Specialist)
      • Vacant, Staff Toxicologist (Specialist)

    • Climate Indicators and Site Assessment Section

      • Carmen Milanes, MPH, Environmental Program Manager I (Supervisory), Section Chief
      • James Carlisle, DVM (Retired Annuitant), Staff Toxicologist (Specialist)
      • Hristo Hristov, M.D., Ph.D., Staff Toxicologist (Specialist)
      • Bennett Hughes-Lock, Environmental Scientist
      • Tamara Kadir, M.S., Senior Environmental Scientist (Specialist)
      • Regina Linville, Ph.D., Staff Toxicologist (Specialist)
      • Amanda Palumbo, Ph.D., Staff Toxicologist (Specialist)
      • Emma Tanner, Environmental Scientist
      • Vacant, Senior Environmental Scientist (Specialist)
      • Vacant, Staff Toxicologist (Specialist)

    Community and Environmental Epidemiology Research Branch (CEERB)

    • Vacant, Supervising Toxicologist (Managerial), Branch Chief
      • Vacant, Environmental Program Manager I (Supervisory)

    • Air and Climate Epidemiology Section

      • Rupa Basu, MPH, Ph.D., Senior Toxicologist, Section Chief
      • Keita Ebisu, Ph.D., Research Scientist IV (Epidemiology/Biostatistics)
      • Vanessa Galaviz, Ph.D.*, Staff Toxicologist (Specialist) *On loan to CalEPA
      • Leona Scanlan, Ph.D., Staff Toxicologist (Specialist)
      • Amal Syed, MPH, Research Scientist III (Epidemiology/Biostatistics)
      • Tessa Wardle, MS, Research Scientist I (Epidemiology/Biostatistics)
      • Xiangmei Wu, Ph.D., Research Scientist IV (Epidemiology/Biostatistics)
      • Vacant, Research Scientist III (Epidemiology/Biostatistics)
      • Vacant, Staff Toxicologist (Specialist)

    • Community Assessment and Environmental Trends Section

      • Laura August, Environmental Program Manager I (Supervisory), Section Chief
        • Vacant, Research Scientist IV (Epidemiology/Biostatistics)
        • Community Assessment and Research Unit
          • Andrew Slocombe, MS, Research Scientist Supervisor I (Epidemiology/Biostatistics)
          • Komal Bangia, MPH, Research Scientist III (Epidemiology/Biostatistics)
          • Vacant, Research Scientist II (Physical/Engineering Sciences)
          • Vacant, Research Scientist Supervisor I, Unit Chief
        • Environmental Trends Unit
          • Kelsey Ranjbar, MPH, Research Scientist II (Epidemiology/Biostatistics)
          • Zoe Varner, MPH, Research Scientist I (Epidemiology/Biostatistics)
          • Vacant, Senior Environmental Scientist (Supervisory), Unit Chief
          • Vacant, Senior Environmental Scientist (Specialist)

    • Community Health and Environmental Impacts Section

      • Alvaro Alvarado, Ph.D., Senior Toxicologist, Section Chief
      • Karen Riveles Carrera, Ph.D., MPH, Staff Toxicologist (Specialist)
      • Sammi Chung, MS, Research Scientist I (Epidemiology/Biostatistics)
      • Kenneth Kloc, Ph.D., Staff Toxicologist (Specialist)
      • K. Lily Wu Moore, Ph.D., Staff Toxicologist (Specialist)
      • Laurel Plummer, Ph.D., Staff Toxicologist (Specialist)
      • Rose Schmitz, MS, Research Scientist III (Epidemiology/Biostatistics)

    • Extreme Heat Ranking System Development Section

      • Walker Wieland, Environmental Program Manager I (Supervisory), Section Chief
      • Vacant, Senior Environmental Scientist (Specialist)
      • Vacant, Research Scientist III (Epidemiology/Biostatistics)
      • Vacant, Research Scientist IV (Epidemiology/Biostatistics)

    Pesticide and Environmental Toxicology Branch (PETB)

    Elaine Khan, Ph.D., Supervising Toxicologist (Managerial), Branch Chief

    • Fish, Ecotoxicology, and Water Section

      • Wesley Smith, Ph.D., Senior Toxicologist, Section Chief
      • Lori Chumney, M.S., Senior Environmental Scientist (Specialist)
      • Shannon Murphy, Ph.D., Staff Toxicologist (Specialist)
      • H. Tran Pham, MPH, Research Scientist I (E/B)
      • Vacant, Staff Toxicologist (Specialist)
      • Vacant, Staff Toxicologist (Specialist)

    • Pesticide and Food Toxicology Section

      • Katherine Sutherland Ashley, Ph.D., Senior Toxicologist, Section Chief
      • Jocelyn Claude, Ph.D., Staff Toxicologist (Specialist)
      • Jason Kilian, Ph.D., Associate Toxicologist
      • Lori Miyasato, Ph.D., Associate Toxicologist
      • Kim Truong, Ph.D., Staff Toxicologist (Specialist)

    • Pesticide Exposure Evaluation and Medical Education Section

      • Ouahiba Laribi, Ph.D., Senior Toxicologist, Section Chief
      • Alanna Bares, M.D., MPH, Public Health Medical Officer II
      • James Nakashima, Ph.D., Staff Toxicologist (Specialist)
      • Jing Tao, Ph.D., Research Scientist IV (Chemical Sciences)
      • Nancy Villasenor, M.S., Health Program Specialist I

    • Special Investigations Section

      • Patty Wong Yim, Ph.D. (Retired Annuitant), Senior Toxicologist

    • Water Toxicology Section

      • Chris Banks, Ph.D., Senior Toxicologist, Section Chief
      • Ida Flores Avila, Ph.D., Staff Toxicologist (Specialist)
      • John Johnson, Ph.D., Staff Toxicologist (Specialist)
      • Dan Qiao, M.D., Ph.D., Staff Toxicologist (Specialist)
      • Craig Steinmaus, M.D., MPH, Public Health Medical Officer III
      • Vacant, Staff Toxicologist (Specialist)
      • Vacant, Staff Toxicologist (Specialist)

    Reproductive and Cancer Hazard Assessment Branch (RCHAB)

    Martha Sandy, Ph.D., Supervising Toxicologist (Managerial), Branch Chief

    • Cancer Toxicology and Epidemiology Section

      • Meng Sun, Ph.D., Senior Toxicologist, Section Chief
      • Sarah Cashin, Ph.D., Associate Toxicologist
      • Vanessa Cheng, Ph.D., Associate Toxicologist
      • Neela Guha, Ph.D., Research Scientist III (Epidemiology/Biostatistics)
      • W. Kate Li, Ph.D., Staff Toxicologist (Specialist)
      • Gwendolyn Osborne, MD, MPH, Staff Toxicologist (Specialist)
      • Karin Ricker, Ph.D., Staff Toxicologist (Specialist)
      • Feng Tsai, Ph.D., Staff Toxicologist (Specialist)
      • Vacant, Staff Toxicologist (Specialist)
      • Vacant, Staff Toxicologist (Specialist)
      • Vacant, Senior Environmental Scientist (Specialist)
      • Vacant, Research Scientist III (Epidemiology/Biostatistics)

    • Reproductive Toxicology and Epidemiology Section

      • Francisco Moran Messen, Ph.D., Senior Toxicologist, Section Chief
      • Faye Andrews, Ph.D., MPH, Research Scientist III (Epidemiology/Biostatistics)
      • Marlissa Campbell, Ph.D., Staff Toxicologist (Specialist)
      • Erin Delker, Ph.D., MPH, Research Scientist III (Epidemiology/Biostatistics)
      • Poorni Iyer, Ph.D., Staff Toxicologist (Specialist)
      • Farla Kaufman, Ph.D., Staff Toxicologist (Specialist)
      • Yassaman Niknam, Ph.D., Staff Toxicologist (Specialist)
      • Sarah Park, Ph.D., Associate Toxicologist
      • Sarah Saucier, Ph.D., Staff Toxicologist (Specialist)
      • Gabriel Tukeman, Ph.D., Staff Toxicologist (Specialist)

    • Safer Alternatives Assessment and Biomonitoring Section

      • Stephanie Jarmul, MPH, Research Scientist Supervisor I (Epidemiology/Biostatistics), Section Chief
      • Rebeca Belloso, Health Program Specialist I
      • Meltem Musa, Ph.D., Staff Toxicologist (Specialist)
      • Aalekhya Reddam, Ph.D., Research Scientist III (Epidemiology/Biostatistics)
      • Daniel Sultana, M.S., Research Scientist III (Epidemiology/Biostatistics)
      • McKenna Thompson, Research Scientist I (Epidemiology/Biostatistics)
      • Vacant, Senior Environmental Scientist (Specialist)

    Administrative Services Division

    • Mike Gyurics, Deputy Director
      • Vacant, Office Technician (Typing)

    Contracts and Business Services Branch

    Amber Van Alstyne, Staff Services Manager I, Branch Chief

    • Business Services Section

      • Hector Gonzalez, Associate Business Management Analyst
      • Donnie Terry, Business Service Assistant (Specialist)

    • Contracts Section

      • Matt Freeman, Associate Governmental Program Analyst
      • Ellie Luna (Retired Annuitant), Associate Governmental Program Analyst

    Fiscal Services Branch

    Israel Leas, Staff Services Manager II (Supervisory), Branch Chief

    • Accounting Section

      • Neha Desai, Accountant I
      • Alvin Hom, Accounting Officer
      • Van Tran, Senior Accounting Officer

    • Budgets Section

      • Aaron Holt, Associate Budget Analyst

    Human Resources Branch

    Cassaundra Willis, Staff Services Manager I, Branch Chief

    • Classification and Compensation

      • Laurie Ann Purshouse (Retired Annuitant), Associate Personnel Analyst
      • Julia Rollison, Associate Personnel Analyst

    • Examinations

      • Michelle Delisle, Associate Personnel Analyst

    • Transactions

      • Elyssa Laramee, Senior Personnel Specialist

    Information Technology Branch

    Steven Fong, Information Technology Manager I, Branch Chief

    • Desktop and Infrastructure Support Section

      • Vincent Lockett, Information Technology Supervisor II, Section Chief
      • Alexander Chang, Information Technology Specialist I
      • Mary Gerges, Information Technology Associate
      • Christopher Sawders, Information Technology Associate

    • Web Maintenance and Support Section

      • Victor Tam, Information Technology Supervisor II, Section Chief
      • Katherine Chau, Information Technology Specialist I
      • Jeff Nelson, Information Technology Associate

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