HANNAH POSEN is a senior managing associate in the Environmental group of the firm’s Chicago office. Her practice includes defending and advising clients on a wide range of environmental matters, including civil and criminal enforcement actions, regulatory compliance, civil litigation, and environmental aspects of transactions. Hannah is particularly focused on matters arising under the Clean Air Act and Clean Water Act and she has represented and advised various clients in state and federal enforcement proceedings involving alleged violations relating to air emissions and effluent discharges.
Hannah has extensive experience conducting internal investigations for manufacturing companies relating to Clean Air Act and Clean Water Act compliance issues. Hannah has also defended multiple automotive sector clients against Clean Air Act enforcement actions. Hannah’s litigation experience includes defending a company in a citizen suit and criminal investigation under the Clean Water Act for alleged effluent discharge violations and defending companies against environmental state-law claims.
In addition, Hannah maintains an active pro bono practice representing clients in civil rights litigation in federal court. In 2019, she received the Award for Excellence in Pro Bono Service from the United States District Court for the Northern District of Illinois and the Chicago Chapter of the Federal Bar Association.
Hannah graduated with high distinction from the University of Iowa College of Law in 2016. While in law school, Hannah was the Administrative Director of the Iowa Moot Court Board and a Contributing Editor of the Iowa Law Review. Hannah received her B.A. in Political Science, cum laude from Columbia University, and B.A. in Modern Jewish Studies, magna cum laude from the Jewish Theological Seminary.
Prior to joining Sidley, Hannah served as a Law Clerk to the Honorable Michael J. Melloy of the United States Court of Appeals for the Eighth Circuit.