Renner K. Walker

Renner K. Walker

  • Of Counsel
  • New York


Renner Walker is an experienced litigator, whose practice focuses on representing plaintiffs in complex cases involving environmental justice, civil and human rights, consumer protection, products liability, and mass torts.

Before joining Hausfeld, Renner was a senior associate at a prominent national plaintiffs’ civil litigation firm, where he represented thousands of children who were lead poisoned in the Flint Water Crisis, as well as individuals who were injured by defective and asbestos-containing products nationwide. He was the firm’s primary appellate and complex motion attorney, briefing and arguing a wide array of dispositive, jurisdictional, evidentiary, and Daubert motions in both trial and appellate courts across the country.

Previously, he served as an Assistant Attorney General in the Iowa Attorney General’s Office, where he practiced environmental, administrative, and constitutional law. He advised administrative agencies and litigated cases involving novel issues of constitutional, statutory, and regulatory law, all while maintaining a busy administrative prosecution docket. He began his legal career by serving as the judicial law clerk to the Honorable Mark S. Cady, Chief Justice of the Iowa Supreme Court.

Renner earned his J.D. with highest honors in 2012 from Drake University Law School, where he was elected to the Order of the Coif and the Order of the Barristers, served on the Editorial Board of the Drake Law Review, and captained Drake’s environmental law moot court team. In 2017, he held a graduate research fellowship in environmental law at the Elisabeth Haub School of Law at Pace University, where he also earned an LL.M. in Environmental Law, summa cum laude.


Renner has represented clients in federal, state, and administrative courts across the country. He represents individuals, governments, and businesses seeking justice. Some of his current and former clients include farmers who were sold defective crop treatments, whistleblowers who warn of dangerous products and fraudulent practices, children who were poisoned by lead in drinking water, workers harmed by defective products, and state administrative agencies responsible for protecting the environment and public health.