Dennis M. Sullivan Of Counsel

Phone: (608) 663-1882
Fax: (608) 663-1889
Assistant Name: Leah Watson
Assistant Phone: (608) 663-1883
Dennis was formerly a managing partner with Herrick & Hart, Eau Claire, Wisconsin, where he practiced for 28 years, representing product manufacturers and insurance companies in claims alleging product defect and negligence. Dennis also has extensive commercial litigation experience including trade secret and breach of fiduciary duty claims. He has tried cases throughout Wisconsin including federal district court. Dennis has successfully argued cases before the Wisconsin Court of Appeals, Wisconsin Supreme Court and the Seventh Circuit Court of Appeals and has been listed in Best Lawyers in America and Wisconsin Super Lawyers. Dennis has a Martindale-Hubbell rating of AV.

Super Lawyers Awards


Practice Areas

Appellate & Legal Issues, Commercial Litigation, General Negligence, Insurance Coverage, Premises Liability, Products Liability, Toxic Tort Law, Workers' Compensation

Bar Admissions

  • 6th Circuit Court of Appeals
  • 7th Circuit Court of Appeals
  • State of Wisconsin
  • US District Court Eastern District of Michigan
  • US District Court Eastern District of Wisconsin
  • US District Court Western District of Wisconsin


  • J.D., University of Wisconsin Law School, 1980
  • B.S., University of Wisconsin at Madison, 1975

Professional Affiliations

  • American Bar Association
  • Dane County Bar Association
  • DRI
  • Litigation Counsel of America
  • Transportation Law Association
  • Western District Bar Association
  • Wisconsin Bar Association
  • Wisconsin Defense Counsel

Representative Cases

  • Carl v Gulf Stream, 165 Wis.611 (Wis App 611)
  • D'Huyvetter v A O Smith, 164 Wis.2d 306 (Wis App 1991)
  • Hatleberg v Norwest, 283 Wis.2d 234 (Wis 2005)
  • Norwest v Plourde, 185 Wis.2d 377 (Wis App 1994)
  • Tyler v Riverbank, 299 Wis.2d 751 (Wis 2007)
  • Welin v Amer Fam., 292 Wis.2d 73 (Wis 2006)

Community Involvement

  • L.E. Phillips Career Development Center, Past Board Director and Past President
  • Wisconsin Equal Justice Foundation, Board Director

Honors & Awards

  • Listed in Wisconsin Super Lawyers
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