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Grant Killoran is a shareholder with the law firm of O’Neil, Cannon, Hollman, DeJong & Laing S.C. and is the 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 a Fellow with the American Bar Foundation and a Fellow with the Wisconsin Law Foundation and serves as one of the State Bar of Wisconsin’s five Delegates to the American Bar Association’s House Delegates. He is the Co-Editor of the ABA Section of Litigation Health Law Litigation Committee’s Health Law Litigation Newsletter and of the Meritas Law Firms Worldwide’s Healthcare Newsletter.

Grant is listed in The Best Lawyers in America®.  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.


Representative Case Experience

  • In the Matter of the Rehabilitation of the Segregated Account of Ambac Assurance Corporation, Dane County, WI, Case No. 10-CV-1576 (2017)
  • Walby v. BuySeasons, Inc., U.S.D.C. for the E.D. of WI Case No. 2:17-CV-896
  • Brown v. State Collection Service, Inc., et al., U.S.D.C. for the E.D. of WI Case No. 16-CV-1533
  • Lang v. Lang, et al., Milwaukee County, WI, Circuit Court Case No. 15-CV-7464
  • Myers v. Americollect, Inc., et al., U.S.D.C. for the E.D. of WI Case No. 1:15-CV-965 (2017)
  • Marine Travelift, Inc. v. Ascom S.p.A, et al., U.S.D.C. for the E.D. of WI Case No. 1:14-CV-0443 (2017)
  • Marine Travelift, Inc v. Cimolai Technology S.p.A., et al., U.S.D.C. for the E.D. of WI Case No. 1:16-CV-338 (2016)
  • Nowosad, et al. v. Synthes, Inc., et al., Milwaukee County, WI, Case No. 14-CV-8461 (2016)
  • Bohlman v. Aurora Health Care, Inc., Milwaukee County, WI, Case No. 12-CV-694 (2015)
  • Kaminski v. Aurora Health Care, Inc., et al., Milwaukee County, WI, Case No. 12-CV-10538 (2015)
  • M2 Logistics, Inc. v. Roehl Transport, Inc., et al., Brown County, WI, Case No. 09-CV-1677 (2015)
  • Bellin Memorial Hospital, Inc. v. Bay Area Medical Center, Inc., Marinette County, WI, Case No. 14-CV-67 (2015)
  • ProHealth Care, Inc. v. HealthEOS by MultiPlan, Inc., Waukesha County, WI, Case No. 11-CV-1049 (2014)
  • Orbis Corporation v. Rehrig Pacific Company, U.S.D.C. for the E.D. of WI Case No. 2:12-CV-1073 (2013)
  •      Royal Concrete Concepts, Inc. v. Shuttlelift, Inc., U.S.D.C. for S.D. of FL Case No. 11-80821-CV (2011)
  • Fincantieri Group, LLC v. Marine Travelift, Inc., Door County, WI, Case No. 11-CV-59 (2011)
  • Jedson Engineering, Inc. v. Spirit Construction Services, Inc., et al., Brown County, WI, Case No. 07-CV-2545 (2011)
  • W.G.&R. Furniture Company v. Boston, Inc., et al. Brown County, WI, Case No. 09-CV-2385 (2010)
  • Specialty Tapes, LLC v. CAT Industries, LLC, et al., Racine County, WI, Case No. 09-CV-1698 (2010)
  • Mahoney v. Prevea Health Services, Inc., et al., Brown County, WI, Case No. 08-CV-1925 (2009)
  • Tanke v. Prevea Clinic, Inc., Brown County, WI, Case No. 08-CV-1433 (2009)
  • Laughlin, et al. v. ProHealth Care, Inc., et al., Waukesha County, WI, Case No. 05-CV-1109 (2007)
  • Covenant Medical Center, Inc. v. Skierka, et al., Butler County, IA, Case No. LACV 019544 (2007)
  • Summers v. Hurley Health Services, et al., Genesee County, MI, Case No. 05-81687 (2007)
  • The Cadle Company II, Inc. v. Bain, Brown County, WI, Case No. 05-CV-169 (2007)
  • Boruta v. Medical College of Wisconsin, Milwaukee County, WI, Case No. 06-CV-6794 (2006)
  • Rivera, et al. v. Network Health Plan of WI, U.S.D.C. for E.D. of WI Case No. 02-1055 (2005)
  • Fisher Scientific Company LLC v. Witte, et al., U.S.D.C. for W.D. of PA Case No. 04 0596 (2006)
  • Benitiec Australia Ltd. v. Promega Corporation, et al., U.S.D.C. for DE Case No. 04-889 (2005)
  • Godiwalla v. Children’s Hospital, Inc., et al., U.S.D.C. for E.D. of WI Case No. 02-C-906 (2004)
  • Cababa v. St. Francis Hospital, Inc., U.S.D.C. for E.D. of WI Case No. 02-C-673 (2003)
  • St. Joseph Regional Medical Center v. General Growth, et al., Milwaukee County, WI, Case No. 00-CV-921 (2002)
  • Fuhrmann, et al. v. Network Health System, Inc., Waupaca County, WI, Case No. 00-CV-174 (2001)
  • Radiology Consultants, S.C., et al. v. Huberty, et al., Racine County, WI, Case No. 99-CV-1729 (2000)
  • Renaissance Faire Limited Partnership v. Flex Cable/Kirkof Group, et al., Milwaukee County, WI, Case No. 90-CV-714 (1995)
  • Soik, et al. v. Stokely, USA, Inc., 175 Wis. 2d 456, 498 N.W.2d 897 (1993)

Awards/Distinction

  • Grant is listed in The Best Lawyers in America® in the practice area of Litigation Health Care
  • 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 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 is a Fellow with the American Bar Foundation, membership in which is limited to one-third of one percent of the lawyers in America
  • Grant is a Fellow with the Wisconsin Law Foundation, membership in which is limited to 2.5% of the members of the State Bar of Wisconsin
  • Grant repeatedly has been elected by the State Bar of Wisconsin to serve as one of its five Delegates to the American Bar Association House of Delegates
  • Grant repeatedly has been named one of Milwaukee’s “Leading Lawyers” by M Magazine, in conjunction with Avvo, in the area of health care law and in litigation
  • Grant has been selected as a “Top Rated Lawyer” in health care law by American Lawyer Media at Martindale-Hubbell®
  • Grant was named to the “2015 Irish Legal 100” as a leading figure in law across the U.S. by The Irish Voice Newspaper
  • Grant has been selected as an Outstanding Newsletter Editor and an      Outstanding Subcommittee Chair by the American Bar Association
  • Grant has been named one of “Wisconsin’s Top Rated Lawyers” for health care law by “The Definitive Guide to Legal Representation in Wisconsin
  • Law & Politics Magazine has selected Grant for inclusion in Wisconsin Super Lawyers, a distinction limited to the top 5% of Wisconsin attorneys
  • 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, American Bar Association Section of Litigation Health Law Litigation Newsletter (2003–2007, 2011–present) (ABA Outstanding Subcommittee Chair 2004, 2007 and 2014) (ABA Outstanding Newsletter Editor 2005)
  • 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 and PINNACLE Seminars Annual Constitutional Law Symposium 2017 seminar, “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 and PINNACLE Seminars  Know Your Writes:  Next Level Legal Writing seminar, “End Product: Ethical Considerations for Managing Electronic Legal Communications” (Madison, WI, May 2017)
  • Author, “American Bar Association House of Delegates Update,” American Bar Association Section of Litigation Health Law Litigation Newsletter (Spring 2017)
  • Chair and Speaker, State Bar of Wisconsin and PINNACLE Seminars With Liberty & Justice: A Constitutional Law Symposium seminar, “Quarantine in the Time of Ebola (and Now Zika)” (Milwaukee, WI, December 2016)
  • Author, “American Bar Association House of Delegates Update,” American Bar Association Section of Litigation Health Law Litigation Newsletter (Summer 2016)
  • Author and Speaker, State Bar of Texas 10th Annual Bill of Rights Course seminar, “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, “American Bar Association House of Delegates Update,” American Bar Association Section of Litigation Health Law Litigation Newsletter (Winter 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 seminar, “Ebola Panic–When Public Health Concerns Confront the Constitution” (Austin, TX, May 2015)
  • Author, “American Bar Association House of Delegates Update,” American Bar Association Section of Litigation Health Law Litigation Newsletter (Spring 2015)
  • Speaker, State Bar of Wisconsin and PINNACLE Seminars 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 and PINNACLE Seminars 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 and PINNACLE Seminars 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, O’Neil, Cannon, Hollman, DeJong & Laing in-house seminar, “Formal Ethics Opinion EF-12-01: The Transmission and Receipt of Electronic Documents Containing Metadata” (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, 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)
  • Author, “American Bar Association House of Delegates Update,” American Bar Association Section of Litigation Health Law Litigation Newsletter (Winter 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, “Can Patient Safety Initiatives Succeed Without Tort Reform?” (Tampa, FL, October 2004)
  • Author, “Courts Reject Antitrust Challenges to Hospital Exclusive Provider Contracts,” website article (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, University of Minnesota School of Law The Journal of Law and Inequality (1988–1989)

Professional Activities

  • Life Fellow, American Bar Foundation
  • Fellow, Wisconsin Law Foundation
  • Delegate, American Bar Association House of Delegates (1997–1999, 2003– 2009, 2014–present)
  • Co-Editor, American Bar Association Section of Litigation Health Law Litigation Newsletter (2003–2007, 2011–present) (ABA Outstanding Subcommittee Chair 2004, 2007 and 2014) (ABA Outstanding Newsletter Editor 2005)
  • Co-Editor, Meritas Law Firms Worldwide’s Healthcare Newsletter, (2018–present)
  • Member, Meritas Law Firms Worldwide U.S./Canadian Litigation Practice Group Steering Committee (2013–present)
  • Member, Meritas Law Firms Worldwide Healthcare Practice Group Steering Committee 2016-present)
  • Member, Milwaukee Bar Association Milwaukee Justice Center Committee (2009–present)
  • 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, Health Care Section and Trial Practice Committee)
  • Member, American Health Lawyers Association
  • Member, State Bar of Wisconsin (Litigation Committee and Sports, Arts and Entertainment Committee)
  • Member, Milwaukee Bar Association

Community Service

  • Director, Milwaukee Debate League (2013–present)
  • Steering Committee Member, WMSE Radio, 91.7 FM, Milwaukee, WI (Founding Member and DJ) (2002–present)
  • Board Member, North Point Lighthouse Friends, Inc. (2015–present)
  • Volunteer, Milwaukee Justice Center (2008-2016)
  • Director, Decatur Lake and Mill Race Association (2011–2016)
  • Volunteer, Milwaukee Justice Center (2008–present)
  • Board Member, Milwaukee Shakespeare (2008–2009)
  • President, Macalester College Alumni Association Board of Director (2000–2002), (Director, 1996–2002)
  • General Manager–Music Director, WMCN Radio, 91.7 FM, St. Paul, MN (1984–1986)

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