Mark A. Vander Laan


Mark Vander Laan is a litigator companies want on their side when the stakes are high. With over 40 years experience trying cases and settling business disputes, his clients see him as fair-minded but aggressive in bet-the-company cases — always prepared to go to trial, but with an ability to quickly discern the best course of action for their business. Mark’s first step with any new matter is to sit down with his client and get a thorough understanding of their needs and tolerances. Only then can they develop a proper legal strategy — whether tackling complex corporate/shareholder disputes or high-profile client disputes or a white collar defense. Because business disputes often take unexpected twists and turns, Mark’s style is to err on the side of more communication, making an effort to explain situations and legal options in clear, concise business terms.

His legal experience is comprehensive, including business and fiduciary litigation, white collar crime and investigations, representing municipalities as well as appealing and advocating for business and individuals at the state and federal levels. His clients have included Procter & Gamble, the Archdiocese of Cincinnati and a variety of large privately-held and public companies, and individuals and institutions serving in fiduciary capabilities.

Mark pays close attention to the development of the firm’s next generation of litigators. He believes that Dinsmore attorneys need to be “hands-on” early in their careers — gaining trial and appellate experience whenever possible — increasing the firm’s ability to provide a deep and experienced bench well into the future.

He teaches legal ethics as an Adjunct Professor at the University of Cincinnati College of Law. He is also a champion for the less-fortunate, serving as Trustee and President for Volunteer Lawyers for the Poor, as Chairman of the Board for The Center for Closing the Health Gap of Greater Cincinnati and as a past Board Member of Ohio Justice and Policy Center.


  • University of Michigan Law School  (J.D., 1972)
  • Hope College  (A.B., cum laude, 1970)

Bar Admissions

  • Ohio

Court Admissions

  • U.S. Supreme Court
  • Sixth Circuit Court of Appeals
  • Southern District of Ohio
  • Northern District of Ohio
  • U.S. Tax Court
  • District of Colorado


  • Ohio Ethics Commission
  • Adjunct Professor of Legal Ethics, University of Cincinnati College of Law
  • Cincinnati Bar Association, Ethics Committee, past Chair
  • Ohio State Bar Association, Litigation Section
  • American Bar Association, Litigation Section 
  • State of Ohio, former Deputy Special Prosecutor
  • City of Blue Ash, Ohio, City Solicitor
  • National Diocesan Attorneys Association
  • Cincinnati Southern Railway, Trustee and President, 1992-2012 
  • Potter Stewart Inn of Court, Master of the Bench
  • Supreme Court of Ohio, past Member, Rules Revision Committee
  • Indian Hill Church, Past President, Board of Stewards
  • University of Cincinnati College of Law, Board of Visitors


  • Named the Best Lawyers'® Cincinnati Appellate Practice "Lawyer of the Year" - 2012, 2014 
  • Peer Review Rated AV in Martindale-Hubbell
  • Named the Best Lawyers'® Cincinnati Litigation "Lawyer of the Year" - 2009, 2013
  • Selected for the Ohio Super Lawyers® List 
  • Who's Who in America, Who's Who in the Midwest, Who's Who in Law
  • Listed in Chambers USA®: America's Leading Lawyers for Business, Litigation: General Commercial 
  • Cincy Leading Lawyer, Cincy Magazine
  • American Board of Trial Advocates
  • Listed in The Best Lawyers in America© for Commercial and Appellate Practice Litigation
  • Named the Best Lawyers® Cincinnati Litigation – Municipal “Lawyer of the Year” - 2015
  • Named Benchmark Litigation Star in Ohio for the 2016 Edition