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John Ratnaswamy founded his own law firm after having served as a co-founder and Partner at a nationally recognized energy boutique law firm. John has spent more than two decades counseling and representing electric and natural gas industry clients, including before utility commissions and on appeal. John has been selected for inclusion in The Best Lawyers in America© from 2010-2024 and was named its 2014 Chicago “Lawyer of the Year” in the field of Energy Law. John also has been recognized in Chambers USA from 2007-2018, the Leading Lawyers Network from 2012-2024, and by Super Lawyers® from 2010-2023 as an Illinois lawyer in the field of energy and natural resources law.*

John also has over 20 years of experience in counseling, teaching, and writing on lawyer professional responsibility and ethics matters.  He also is a former member of the Hearing Board of the Illinois Attorney Registration and Disciplinary Commission.

In addition, John served as the American Bar Association Advisor to the Uniform Law Commission’s Drafting Committee on a Tort Law Relating to Drones. John also served as the Vice Chair, and as the Editor in Chief of the Newsletter, of the Space Law Committee of the ABA Section of Science and Technology Law.

Professional Experience

John Ratnaswamy founded The Office of John Ratnaswamy, LLC, in April 2019.


He was a co-founder and Partner at the widely recognized energy boutique law firm Rooney Rippie & Ratnaswamy LLP from March 2010 to February 2019.


John was a Partner in the energy and litigation practices at Foley & Lardner LLP from February 2001 to February 2010.


John was a Partner, and before that an Associate, at Hopkins & Sutter, LLP, from September 1987 to January 2001.


John clerked for the late Honorable Francis D. Murnaghan, Jr., of the U.S. Court of Appeals for the Fourth Circuit (1987), and the late Honorable Norma L. Shapiro of the U.S. District Court for the Eastern District of Pennsylvania (1985-1986).

Photo of John Ratnaswamy

Practice Areas

Energy Regulation and Appeals

Professional Responsibility


J.D., Northwestern University

School of Law, cum laude

B.S./M.A., Communication Studies, Northwestern University


llinois (1985)

Minnesota (2006)

Wisconsin (2015)

Colorado (2016)

U.S. District Court, Northern District of Illinois

U.S. District Court, Central District of Illinois

U.S. District Court, Northern District of Texas

U.S. Court of Appeals, Fourth Circuit

U.S. Court of Appeals, Fifth Circuit

U.S. Court of Appeals, Seventh Circuit

United States Supreme Court

Recent Speaking Engagements

Mr. Ratnaswamy frequently speaks on issues regarding energy regulation and legal and judicial ethics. His presentations include:

  • “Ethics – Are You A Cyber Ready Attorney?”, Energy Bar Association Midyear Energy Forum, October 2021.

  • "Legal Ethics Issues for State Utility Regulation Practitioners," Wisconsin Public Utility Institute, Public Utilities Law Update 2021, March 2021.

  • “Legal Foundations of Regulation,” American Gas Association (AGA) Rates School, July 2020.

  • “Legal Ethics Issues for State Utility Regulation Practitioners,” Wisconsin Public Utility Institute, Public Utilities Law Update 2020, March 2020.

  • Panel Participant on Bullying, Discrimination, and Equality, Chicago Comic and Entertainment Expo (C2E2), February 2020.

  • "Ethics Traps for the Unwary and Even for the Wary," Chicago Bar Association Energy, Telecommunications and Water Committee, January 2020.

  • “Legal Foundations of Regulation,” American Gas Association (AGA) Rates School, July 2019.

  • “State and Local Issues Impacting UAS [Unmanned Aircraft Systems],” AUVSI Exponential All Things Unmanned Conference, April 2019.

Recent Publications

Mr. Ratnaswamy has published articles on a number of subjects, such as the inter-relationship of federal bankruptcy and energy regulation statutes. He has written over 70 columns on legal ethics in The Bencher. His publications include:

  • “Justice Kagan Recuses from a Case and Cites the New Supreme Court Code of Conduct,” The Bencher, March/April 2024.

  • “The Roots of American Legal Ethics Codes,” The Bencher, November/December 2023.

  • “Seeking Advice About Compliance with Ethics Rules,” The Bencher, July/August 2023.

  • “Legal Ethics and Witnesses,” The Bencher, November/December 2022.

  • New ABA Ethics Opinion on Solicitation,” The Bencher, July/August 2022.

  • “Judicial Participation in Lawyer Diversion and Legal Assistance Programs (New York Report),” The Bencher, March/April 2022.

  • “Responding to On-Line Criticism,” The Bencher, November/December 2021.

  • "Virtual Practice,” The Bencher, July/August 2021.

  • “Justice Ginsburg’s 1996 Speech on ‘Supreme Court Pronouncements on the Conduct of Lawyers,'” The Bencher, March/April 2021.

  • "Cybersecurity,” The Bencher, November/December 2020.

  • “Disasters and Crisis,” The Bencher, July/August 2020.

  • “Lawyer Well-Being and Attorney Regulation,” The Bencher, March / April 2020.

  • “Legal Ethics and Social Media,” The Bencher, November/December 2019.

  • “Application of Ethics Rules to Conduct Performed Outside of Legal Practice,” The Bencher, July/August 2019.

  • “Fee Financing”, The Bencher, March/April 2019.

*The Illinois Supreme Court does not recognize certifications of specialties in the practice of law and no award or recognition is a requirement to practice law in Illinois.

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