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Mark E. Sims


Mark Sims practices in the Business Representation & Transactions Practice Group and works primarily in the federal income tax, business planning and healthcare areas. Mark's federal tax practice involves individual, corporate, S corporation and partnership tax planning, including like kind exchanges and real estate transactions. He advises public and private companies regarding the tax aspects of mergers and acquisitions and executive compensation matters, including equity and incentive plans, stock option plans and deferred compensation arrangements.  Mark also represents clients on matters before the IRS and state tax agencies.  Additionally, he has significant experience focusing on tax issues related to the formation and operation of tax exempt organizations.  Mark has also advised clients regarding federal and state new markets tax credits.

Mark serves in a general counsel role for a number of closely held businesses and represents purchasers and sellers of businesses and business interests. His healthcare practice concentrates on business issues facing healthcare providers, including representing physician and dental groups in structuring, purchasing and selling medical practices.  Mark also has extensive experience drafting, reviewing and negotiating physician employment agreements. 

Mark has been an adjunct professor at the University of Cincinnati College of Law and speaks frequently on tax and healthcare related issues. 

Awards & Recognitions


Speaking Engagements


Professional & Community Involvement

  • American Bar Association, Tax and Health Law Sections
  • Ohio State Bar Association, Federal Taxation Specialty Board
  • Cincinnati Bar Association, Tax and Health Care Sections, Past President of Tax Section
  • Hamilton County Development Company, Past Board Member and Past President
  • Keep Cincinnati Beautiful, Board Member and Past President
  • Christ the King Parish, Finance Committee
  • St. Rita School for the Deaf, Board Member
Keating Muething & Klekamp PLL
One East Fourth Street
Suite 1400
Cincinnati OH 45202
TEL: (513) 579-6966
FAX: (513) 579-6457

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Practice Areas

Blog Contributions

Bar & Court Admissions
  • Ohio
  • U.S. Claims Court
  • U.S. Tax Court
  • J.D., University of Cincinnati College of Law, 1980
  • LL.M. Taxation, University of Florida Law School, 1981
  • B.B.A., University of Cincinnati, 1977