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F 312.873.2948
  • Education
    • J.D., Northwestern University School of Law, 2016
    • B.A., University of San Francisco, 2012, History
  • Court Admissions
    • U.S. Court of Appeals, Seventh Circuit
    • U.S. District Court, Northern District of Illinois
    • U.S. District Court, Eastern District of Wisconsin

Claire Brennan is a senior associate in Polsinelli’s Commercial Litigation Practice, where she is developing a multifaceted practice focused on complex litigation, health care disputes, and estate administration matters. Claire has also had meaningful trial experience as a young attorney, including acting as second chair in a federal jury trial, first chairing a probate trial regarding estate assets, and first chairing multiple data breach claims across the country. 

As an associate, Claire partners with Polsinelli’s seasoned attorneys to achieve first-rate results for clients by developing a holistic approach to each client’s unique business priorities and concerns. She has successfully obtained early dismissal or judgment in favor of the client through dispositive motions and negotiated favorable settlements. Claire is driven and guided by her role as an advocate for the client.

Claire is the co-founder and current co-chair of Polsinelli Chicago’s annual Day of Service to bring attorneys and clients together in support of the community of Chicago. Past efforts have included packing backpacks for children in the DCFS foster program and back to school kits for CPS teachers.

  • First chaired 2-day trial in the Probate Court of Cook County involving competing claims to estate property.
  • Second-chaired 5-day trial in the U.S. District Court of Massachusetts involving claims of breach of contract and tortious interference.
  • Second-chaired 2-day preliminary injunction hearing in the Circuit Court of Cook County involving claims of breach of contract, tortious interference, and violations of the Illinois Trade Practices Act.
  • Second-chaired 2-day trial in the Circuit Court of Cook County involving claims to quiet title and for damages.
  • First-chaired multiple data breach claims across the country.
  • Assisted with drafting discovery, dispositive motions, and settlement negotiations for clients across a variety of industries involved in both complex and simpler litigation.