Grant Killoran is a shareholder at O’Neil Cannon and the Past Chair of its Litigation Practice Group. He has significant and diverse trial experience representing clients in Wisconsin State and Federal Courts, and courts around the country, focusing on complex business, health care and employment law disputes. Grant also devotes a portion of his practice to arts and entertainment law, with an emphasis on the music industry.
Grant is listed in The Best Lawyers in America® in the practice areas of Commercial Litigation and Litigation-Health Care. He has an AV–Preeminent Peer Review Rating™ with Martindale-Hubbell®, which “reflects an attorney who has reached the heights of professional excellence, has usually practiced law for many years and is recognized for the highest levels of skill and integrity.” He has a 10.0 out of 10.0 rating by Avvo, a national attorney rating service which uses a mathematical model to rate attorneys based on experience, professional achievements, industry recognition and professional conduct.
Grant is an immediate past member of the American Bar Association’s Board of Governors and the ABA House of Delegates. He is a Life Fellow of the American Bar Foundation and a Fellow of the Wisconsin Law Foundation. He is the Co-Chair of the American Bar Foundation for the State of Wisconsin.
Grant Assists Clients With
Complex Commercial and Business Litigation
Health Care Industry Litigation, Disputes and Contracting
Risk Management Counseling
Business Counseling and Advice
Restrictive Covenant and Trade Secrets Litigation
Corporate Disputes
Contract Disputes
Tort Disputes
Appellate Litigation
Alternative Dispute Resolution
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Professional Associations and Affiliations
Governor, American Bar Association (2021-2024) (ABA Board of Governors’ Liaison to the ABA Section of Health Law, Commission on the American Jury, and Forum on Housing and Community Development Law)
Delegate, American Bar Association House of Delegates (1997–2000, 2003– 2009, 2014–2020; 2021-2024)
Life Fellow, American Bar Foundation
Fellow, Wisconsin Law Foundation
Member, Meritas Law Firms Worldwide U.S./Canadian Litigation Practice Group Steering Committee (2013–present)
Member, Meritas Law Firms Worldwide Healthcare and Life Sciences Practice Group Steering Committee 2016-present)
Member, Milwaukee Bar Association Milwaukee Justice Center Committee (2006–2009)
Co-Chair, American Bar Association Section of Litigation Health Law Litigation Committee (2007–2009)
North American Regional Vice-Chair, Lex Mundi Health Care Industries Practice Group (2007–2009)
Member, Milwaukee Bar Association Judicial Selection Committee (1997–2000, 2008–2011)
Member, State Bar of Wisconsin Multidisciplinary Practice Committee (1999–2000)
Director, Milwaukee Young Lawyers Association (1992–2000) (1993 recipient of its Community Service Award)
Barrister, Thomas E. Fairchild Inn, American Inns of Court (2000–2004)
Member, American Bar Association (Section of Litigation, Section of Health Law and Trial Practice Committee)
Member, American Health Lawyers Association
Member, State Bar of Wisconsin
Member, Milwaukee Bar Association
Awards/Distinctions
Grant is listed in The Best Lawyers in America® in the practice areas of Commercial Litigation and Litigation–Health Care
Grant has an AV–Preeminent Peer Review Rating™ with Martindale-Hubbell®, which “reflects an attorney who has reached the heights of professional excellence, has usually practiced law for many years and is recognized for the highest levels of skill and integrity”
Grant has a 10.0 out of 10.0 rating by Avvo, a national attorney rating service which uses a mathematical model to rate attorneys based on experience, professional achievements, industry recognition and professional conduct
Grant is a Life Fellow of the American Bar Foundation, membership in which is limited to one-third of one percent of the lawyers in America
Grant is a Fellow of the Wisconsin Law Foundation, membership in which is limited to 2.5% of the members of the State Bar of Wisconsin
Grant has been selected as one of the “Midwest’s Top Rated Lawyers” in litigation and health care law and a “Top Rated Litigator” by American Lawyer Media and Martindale-Hubbell®
Grant has been named a Wisconsin “Super Lawyer” by Super Lawyers Magazine and Milwaukee Magazine, a distinction limited to the top 5% of Wisconsin attorneys
Grant has been named one of Milwaukee’s “Leading Lawyers” by M Magazine, in conjunction with Avvo, in the areas of health care law and litigation
Grant has been named one of “Wisconsin’s Top Rated Lawyers” for health care law by “The Definitive Guide to Legal Representation in Wisconsin”
Grant has been named to the “Irish Legal 100” as a leading figure in law across the U.S. by The Irish Voice Newspaper
Nightingale’s Health Care News, a national health law publication, has named Grant an “Outstanding Health Care Litigator”
The Milwaukee Young Lawyers Association has awarded Grant its Community Service Award
Articles/Presentations
Editor, Meritas Law Firms Worldwide Healthcare and Life Sciences Newsletter (2019-present)
Editor and Contributor, American Bar Association Section of Litigation Health Law Litigation Newsletter (2003–2007, 2011–2021) (ABA Outstanding Subcommittee Chair 2004, 2007 and 2014) (ABA Outstanding Newsletter Editor 2005)
Author and Speaker, State Bar of Texas 18th Annual Bill of Rights: Litigating the Constitution seminar, “Students for Fair Admissions, Inc. v. Harvard: A Summary of the Decision and its Impact on Academia and Beyond” (Austin, TX, May 2024)
Program Chair and Speaker, State Bar of Wisconsin Annual Constitution Law Symposium 2023, “Students for Fair Admissions, Inc. v. Harvard: The Current State of the Use of Race in College Admissions” (Madison, WI, December 2023)
Program Chair and Speaker, State Bar of Wisconsin Annual Constitution Law Symposium 2022, “Covid-19 Vaccination Mandates: What a Long Strange Trip It’s Been” (Madison, WI, December 2022)
Author and Speaker, State Bar of Texas 16th Annual Bill of Rights: Litigating the Constitution seminar, “The Bounds of State Power and COVID Mandates” (Austin, TX, May 2022)
Author, “COVID-19 Vaccination Mandates: What Now?” The Wisconsin Lawyer (March 2022)
Author, “Ten Considerations Regarding State Government Public Health Powers to Mandate COVID-19 Protective Measures and Vaccination in the United States,” Association of Corporate Counsel’s Global Resource Library (December 2021)
Program Chair and Speaker, State Bar of Wisconsin Annual Constitutional Law Symposium 2021, “My Rights vs. Yours: An Update on Governmental Power to Mandate Vaccination” and “Election Law in a Post-Trump World: Voting Rights Litigation Update” (December 2021)
Author, “The Legal Treatment of Vaccination Injury Claims,” The Wisconsin Lawyer (June 2021)
Author and Speaker, State Bar of Texas 15th Annual Bill of Rights: Litigating the Constitution seminar, “Government Emergency Powers: From Mandatory Vaccinations to Pandemics” (May 2021)
Author, “COVID-19 Vaccination: Legal Landscape & Challenges,” The Wisconsin Lawyer (February 2021) (named a “Top Article of 2021” by the State Bar of Wisconsin)
Program Chair and Speaker, State Bar of Wisconsin Annual Constitutional Law Symposium 2020, “The Tenth Amendment: The Sword and the Shield of the States” and “We Are All Tithers Now: Why Your Tax Dollars Are Spent to Fund the Faithful” (December 2020)
Author, “The New Wave of Litigation: An Early Report on COVID-19 Claims,” The Wisconsin Lawyer (July 2020) (named a “Top Article of 2020” by the State Bar of Wisconsin)
Author and Speaker, State Bar of Texas 14th Annual Bill of Rights: Litigating the Constitution seminar, “We Are All Tithers Now: Public Funding of Religious Institutions” and “The Tenth Amendment: The Sword and Shield of The States” (May 2020)
Author, “Due Process In The Time of Coronavirus,” The Wisconsin Lawyer (April 2020) (named a “Top Article of 2020” by the State Bar of Wisconsin)
Program Chair and Speaker, State Bar of Wisconsin Annual Constitutional Law Symposium 2019, “The Runt Piglet of the Bill of Rights? An Overview of the Third Amendment” (Milwaukee, WI, December 2019)
Author, “When Measles Meet Due Process,” The Wisconsin Lawyer (November 2019) (received special commendation for writing excellence by the State Bar of Wisconsin)
Author and Speaker, State Bar of Texas 13th Annual Bill of Rights: Litigating the Constitution seminar, “The Third Amendment: The Runt Piglet of the Bill of Rights” (Austin, TX, May 2019)
Program Chair and Speaker, State Bar of Wisconsin Annual Constitutional Law Symposium 2018, “The Current State of the Second Amendment” (Milwaukee, WI, December 2018)
Author and Speaker, State Bar of Texas 12th Annual Bill of Rights: Litigating the Constitution seminar, “The Current State of the Second Amendment” (Austin, TX, May 2018)
Author, “Alternative Dispute Resolution in Wisconsin,” website article series (2016–2018)
Program Chair and Speaker, State Bar of Wisconsin Annual Constitutional Law Symposium 2017, “The Electoral College: Where Have We Been and Where are We Going?” (Milwaukee, WI, December 2017)
Author and Speaker, State Bar of Texas 11th Annual Bill of Rights: Litigating the Constitution seminar, “Electoral College: Do We Have a Democracy” (Austin, TX, May 2017)
Program Chair and Speaker, State Bar of Wisconsin Know Your Writes: Next Level Legal Writing seminar, “End Product: Ethical Considerations for Managing Electronic Legal Communications” (Madison, WI, May 2017)
Program Chair and Speaker, State Bar of Wisconsin With Liberty & Justice: A Constitutional Law Symposium, “Quarantine in the Time of Ebola (and Now Zika)” (Milwaukee, WI, December 2016)
Author and Speaker, State Bar of Texas 10th Annual Bill of Rights Course, “Abortion: Where Have We Been and Where Are We About to Go? A Review of Current Cases Before the United States Supreme Court” (Austin, TX, May 2016)
Author, “Local Court Rules in Wisconsin,” website article (November 2015)
Speaker, O’Neil, Cannon, Hollman, DeJong & Laing Hot Legal Topics for Small Firms & Solo Practitioners seminar, “Commercial Arbitration: Arbitration in the Unites States and Abroad” (Milwaukee, WI, October 2015)
Author and Speaker, State Bar of Texas 9th Annual Bill of Rights Course, “Ebola Panic–When Public Health Concerns Confront the Constitution” (Austin, TX, May 2015)
Speaker, State Bar of Wisconsin Trending Topics in Business Litigation seminar, “Commercial Arbitration: An Overview of Arbitration in the United States and Abroad and Some Thoughts on Contractual Arbitration Clauses” (Milwaukee, WI, December 2014)
Speaker, O’Neil, Cannon, Hollman, DeJong & Laing Hot Legal Topics for Small and Solo Practitioners seminar, “Computer Technology in Legal Practice” (Milwaukee, WI, October 2014)
Speaker, Meritas Annual Conference, “Commercial Arbitration: A View from Canada and the United States” (Boston, MA, May 2014)
Author, “An Update on Developments Regarding the Wisconsin and Federal Rules Governing E-Discovery,” website article (February 2014)
Speaker, O’Neil, Cannon, Hollman, DeJong & Laing Hot Topics for In-House Counsel seminar, “Ethical (and Practical) Considerations for Managing E-Discovery and Electronically Stored Information” (Milwaukee, WI, November 2013)
Speaker, State Bar of Wisconsin Trending Topics in Business Litigation seminar, “Managing E-Discovery and Electronically Stored Information: Recent Developments and Some Practical Considerations” (Milwaukee, WI, November 2013)
Speaker, State Bar of Wisconsin Trending Topics in Business Litigation seminar, “E-Discovery: The Wisconsin Rules of Civil Procedure and Some Practical Considerations for Managing Electronically Stored Information” (Milwaukee, WI, November 2012)
Speaker, Lorman Education Services, Medical Records Law in Wisconsin seminar, “Responding to Requests for Protected Health Information in Wisconsin” (Milwaukee, WI, June 2012)
Author, “New Wisconsin Rules of Civil Procedure Governing E-Discovery and Electronically Stored Information,” website article (2011)
Speaker, O’Neil, Cannon, Hollman, DeJong & Laing Hot Topics for In-House Counsel seminar, “E-Discovery: The New Wisconsin Rules of Civil Procedure and Some Ethical Considerations for Managing Electronically Stored Information” (Milwaukee, WI, December 2010)
Moderator and Speaker, State Bar of Wisconsin and Corporate Practice Institute, Inc. seminar, “Legal Ethics: A Review and Update, Including Emerging Issues” (Milwaukee, WI, December 2010)
Author, “Doing Business in United States: Wisconsin,” PLC Cross-Border Doing Business In… Handbook (2008)
Speaker, Lex Mundi North American Regional Conference, “Antitrust and Electronic Data Considerations for the Health Care Industry” (Miami, FL, February 2008)
Speaker, Lex Mundi North American Regional Conference, “Aligning Resources to Practice and Industry Groups” (Toronto, Canada, August 2007)
Speaker, Lorman Education Services, Medical Records Law in Wisconsin seminar, “Responding to Discovery, Subpoenas, Court Orders and Law Enforcement” (Green Bay, WI, May 2007)
Speaker, American Conference Institute, Summit on Healthcare Complex Litigation, “Posturing the Case in the Client’s Favor: Advanced Strategic Considerations for Achieving Early Success” (New York, NY, April 2007)
Speaker, American Board of Quality Assurance and Utilization Review Physicians seminar, “Can Patient Safety Initiatives Succeed Without Tort Reform?” (Tampa, FL, October 2004)
Author, “Courts Continue to Reject Physician Challenges to Hospitals’ Medical Exclusive Contracts,” website article (2003)
Author, “Hospital Medical Exclusive Contracts Find Favor in the Nation’s Courts,” website article (2002)
Speaker, Lorman Education Services, Effective Ways to Protect Your Business When Selling or Purchasing Goods in Wisconsin seminar, “The Do’s and Don’ts for When Disputes and Litigation Approach and Effective Ways to Protect Your Business When Selling or Purchasing Goods in Wisconsin” (Milwaukee, WI, July 1999)
Lead Actor, Storm Clouds–The Trial of Sherman Booth, Milwaukee Bar Foundation (1998)
Speaker, Milwaukee Young Lawyers Association, Nuts & Bolts for New Lawyers seminar, “Working with New Clients and Client Development (Milwaukee, WI, October 1997)
Editor and Member, University of Minnesota School of Law The Journal of Law and Inequality (1987–1989)
Community Involvement
Community Advisory Committee Member, WMSE Radio, 91.7 FM, Milwaukee, WI (Founding Member and DJ) (2002–present)
Board Member, Milwaukee Film (2022–present)
Board Member, North Point Lighthouse Friends, Inc. (2015–present)
Director, Milwaukee Debate League (2013–2018)
Director, Decatur Lake and Mill Race Association (2011–2016)
Board Member, Milwaukee Shakespeare (2008–2009)
President, Macalester College Alumni Association Board of Director (2000–2002) and Director (1996–2002)
General Manager, Music Director and DJ, WMCN Radio, 91.7 FM, St. Paul, MN (1983–1986)
