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.

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

Environmental Health Education, Community Engagement, and Cumulative Impacts

Division of Scientific Programs

Administrative Services Division

Executive Office

  • Kristina Thayer, Ph.D., Director
  • David Edwards, Ph.D., Chief Deputy Director
    • Paula Torrado Plazas, MPH, Environmental Program Manager I (Supervisory)
    • Allison Lensing, Analyst II
      Vacant, Director, Children's Environmental Health Center
  • Kimberly Gettmann, Ph.D., Deputy Director for Scientific Programs
    • Kannan Krishnan, Ph.D., Assistant Deputy Director for Scientific Programs
  • Amy Gilson, Ph.D., Deputy Director, External and Legislative Affairs
  • Mike Gyurics, Deputy Director, Administrative Services
  • Gabriel Allen, Chief Counsel

Office of External and Legislative Affairs

  • Amy Gilson, Ph.D., Deputy Director
    • Krystyna von Henneberg, Ph.D., Analyst II

Proposition 65 Implementation Program

  • Tina Cox, Senior Environmental Scientist (Supervisory), Section Chief
    • Esther Barajas-Ochoa, Analyst II
    • Julia Dolloff, MPH, Senior Environmental Scientist (Specialist)
    • Kiana Vaghefi, Environmental Scientist

Office of Chief Counsel

  • Gabriel Allen, Chief Counsel
    • Corey Friedman, Attorney IV
    • Ryan Mahoney, Attorney III
    • Kristi Morioka, Attorney IV
    • D. Monet Vela, Analyst  II
    • Vacant, Senior Legal Analyst

Environmental Health Education, Community Engagement, and Cumulative Impacts

  • Paula Torrado Plazas, MPH, Environmental Program Manager I (Supervisory)

Division of Scientific Programs

  • Kimberly Gettmann, Ph.D., Deputy Director

    • Kannan Krishnan, Ph.D., Assistant Deputy Director
      • Vacant, Senior Librarian

      • New Toxicology Evaluations Section

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

      • Program Support Section

        • Brian Brown, Supervisor I, Section Chief
        • Hermelinda Jimenez, Management Services Technician
        • E. Sylvie Lee, Analyst II
        • Colin Meinrath, Office Technician (Typing)
        • Vacant, Analyst II

    Air and Site Assessment and Climate Indicators Branch (ASACIB)

    Meng Sun, Ph.D., Supervising Toxicologist (Managerial), Branch Chief

    • Air Toxicology and Risk Assessment Section

      • Rima Woods, Ph.D., Senior Toxicologist, Section Chief
      • 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)
      • Vacant, Staff Toxicologist (Specialist)
      • Vacant, Staff Toxicologist (Specialist)

    • Climate Indicators and Site Assessment Section

      • Nathalie Pham, Ph.D., Senior Toxicologist, Section Chief
      • Annika Alexander-Ozinskas, MS, Senior Environmental Scientist (Specialist)
      • Hristo Hristov, M.D., Ph.D., Staff Toxicologist (Specialist)
      • Bennett Hughes-Lock, Environmental Scientist
      • Tamara Kadir, M.S., Senior Environmental Scientist (Specialist)
      • Michael Kado Ph.D., Associate Toxicologist
      • Regina Linville, Ph.D., Staff Toxicologist (Specialist)
      • Amanda Palumbo, Ph.D., Staff Toxicologist (Specialist)
      • Emma Tanner, Environmental Scientist

    Community and Environmental Epidemiology Research Branch (CEERB)

    • Alvaro Alvarado, Ph.D., Supervising Toxicologist (Managerial), Branch Chief
      • Vacant, Environmental Program Manager I (Supervisory)

    • Air and Climate Epidemiology Section

      • May Bhetraratana, Ph.D., Senior Toxicologist, Section Chief
      • Chloe Skewis, Supervisor I
      • Keita Ebisu, Ph.D., Research Scientist IV (Epidemiology/Biostatistics)
      • Leona Scanlan, Ph.D., Staff Toxicologist (Specialist)
      • Amal Syed, MPH, Research Scientist II (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
        • Ruwan Thilakaratne, Ph.D., Research Scientist IV (Epidemiology/Biostatistics)
        • Community Assessment and Research Unit
          • Andrew Slocombe, MS, Research Scientist Supervisor I (Epidemiology/Biostatistics), Unit Chief
          • Samantha Burns, MS, Research Scientist I (Epidemiology/Biostatistics)
          • Juan Gonzalez, MPH, Health Program Specialist I
          • Vacant, Research Scientist III (Epidemiology/Biostatistics)
        • 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

      • Hye-Youn Park, MPH, Ph.D., Senior Toxicologist, Section Chief
      • Karen Riveles Carrera, Ph.D., MPH, Staff Toxicologist (Specialist)
      • Sammi Chung, MS, Research Scientist I (Epidemiology/Biostatistics)
      • K. Lily Wu Moore, Ph.D., Staff Toxicologist (Specialist)
      • Laurel Plummer, Ph.D., Staff Toxicologist (Specialist)
      • Rose Schmitz, MS, Research Scientist III (Epidemiology/Biostatistics)
      • Vacant, Staff Toxicologist (Specialist)

    • Extreme Heat Ranking System Development Section

      • Walker Wieland, Environmental Program Manager I (Supervisory), Section Chief
      • Felicia Chiang, Ph.D., Senior Environmental Scientist (Specialist)
      • Brooke Bell, Ph.D, Research Scientist III (Epidemiology/Biostatistics)
      • Susannah Cohen, Ph.D., Research Scientist IV (Epidemiology/Biostatistics)

    Pesticide and Environmental Toxicology Branch (PETB)

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

    • Fish, Incident Response, Seafood Safety, and Harmful Algal Bloom 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 II (E/B)
      • Rebecca Stanton, Ph.D., 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., Staff Toxicologist (Specialist)
      • Lori Miyasato, Ph.D., Staff Toxicologist (Specialist)
      • 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

    • Water Toxicology Section

      • Chris Banks, Ph.D., Senior Toxicologist, Section Chief
      • Ida Flores Avila, Ph.D., Staff Toxicologist (Specialist)
      • Scott Coffin, Ph.D., Staff Toxicologist (Specialist)
      • Vicente Escamilia Rivera, Ph.D., Staff Toxicologist (Specialist)
      • John Johnston, Ph.D., Staff Toxicologist (Specialist)
      • Dan Qiao, M.D., Ph.D., Staff Toxicologist (Specialist)
      • Craig Steinmaus, M.D., MPH, Public Health Medical Officer III
      • Molly Schwalb, MPH, Ph.D., Research Scientist III (E/B)

    Reproductive and Cancer Hazard Assessment Branch (RCHAB)

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

    • Cancer Toxicology and Epidemiology Section

      • Maria Alvarado Cruz, Ph.D., Staff Toxicologist (Specialist)
      • Jordan Aron, Ph.D., Research Scientist III (Epidemiology/Biostatistics)
      • Vanessa Cheng, Ph.D., Staff Toxicologist (Specialist)
      • Sarah Elmore Cashin, Ph.D., Staff Toxicologist (Specialist)
      • Claire Heit, Ph.D., Staff Toxicologist (Specialist)
      • W. Kate Li, Ph.D., Staff Toxicologist (Specialist)
      • Homa Sadeghi, Ph.D., Research Scientist III (Epidemiology/Biostatistics)
      • Feng Tsai, Ph.D., Staff Toxicologist (Specialist)
      • Lisheng Zhang, Ph.D., Staff Toxicologist (Specialist)
      • Vacant, Senior Toxicologist, Section Chief
      • Vacant, Staff Toxicologist (Specialist)
      • Vacant, Senior Environmental Scientist (Specialist)

    • Reproductive Toxicology and Epidemiology Section

      • Francisco Moran Messen, Ph.D., Senior Toxicologist, Section Chief
      • Faye Andrews, Ph.D., MPH, Research Scientist III (Epidemiology/Biostatistics)
      • Erin Delker, Ph.D., MPH, Research Scientist III (Epidemiology/Biostatistics)
      • Yassaman Niknam, Ph.D., (.5) Staff Toxicologist (Specialist)
      • Sarah Park, Ph.D., Staff Toxicologist (Specialist)
      • Sarah Saucier, Ph.D., Staff Toxicologist (Specialist)
      • Gabriel Tukeman, Ph.D., Associate Toxicologist
      • Vacant, Staff Toxicologist (Specialist)
      • Vacant, Staff Toxicologist (Specialist)

    • Safer Alternatives Assessment and Biomonitoring Section

      • Stephanie Jarmul, MPH, Research Scientist Supervisor I (Epidemiology/Biostatistics), Section Chief
      • Rebecca 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, MPH, Research Scientist I (Epidemiology/Biostatistics)
      • Vacant, Senior Environmental Scientist (Specialist)

    Administrative Services Division

    • Mike Gyurics, Deputy Director

    Contracts and Business Services Branch

    Amber Van Alstyne, Supervisor I, Branch Chief

    • Business Services Section

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

    • Contracts Section

      • Cindy Vang, Analyst II
      • Vacant, Analyst II

    Fiscal Services Branch

    Israel Leas, Supervisor II, Branch Chief

    • Accounting Section

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

    • Budgets Section

      • Aaron Holt, Analyst II

    Human Resources Branch

    Cassaundra Willis, Supervisor II, Branch Chief

    • Classification and Compensation

      • Veronika Kryukova, Analyst I
      • Julia Rollison, Analyst II

    • Examinations

      • Dominique Kirby, Analyst II

    • Transactions

      • Vacant, 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
      • Vacant, Information Technology Specialist II

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