Which of the following figures served as the Administrator of the Environmental Protection Agency?

Lisa P. Jackson served as the Administrator of the Environmental Protection Agency (EPA) under President Barack Obama from 2009 to 2013. During her tenure, she was instrumental in implementing significant environmental policies, such as those aimed at addressing climate change and regulating greenhouse gas emissions. Jackson's leadership focused on scientific integrity and public health, and she played a key role in promoting the EPA's mission to protect human health and the environment.

Understanding her achievements and the context of her leadership can highlight the importance of this role in the federal government. Andrew Wheeler, Gina McCarthy, and Scott Pruitt also served as Administrators of the EPA, but their tenures occurred at different times, each influencing environmental policy in their unique ways.