Mark R. Feldhaus



Mark R. Feldhaus is a trial attorney with experience in both state and federal courts in Missouri and Illinois. He engages in civil litigation with an emphasis on medical malpractice defense, professional liability, insurance defense and coverage, product liability litigation and commercial litigation. He also advises clients in property management related matters that include risk management, landlord/tenant issues, and state and federal regulatory compliance for affordable housing complexes.

Mark has both pursued and defended his clients’ interests in appeals before courts in both Missouri and Illinois and has tried cases before both juries and judges. His recent trial work successfully defended the care rendered by a hospital accused of causing a brain injury to a newborn during labor and delivery. His recent appellate work has helped assisted living facilities and skilled nursing facilities enforce arbitration clauses in their admission contracts. His recent administrative appellate work on behalf of affordable housing property managers has vindicated their budgets and justified requested rent increases before government regulators. For his work, Mark has been recognized three times by his peers as a Missouri & Kansas Rising Star. He earned his J.D. from Washington University School of Law.


  • Missouri & Kansas Rising Stars, 2010 – Present
  • Washington University Scholar in Law Recipient
  • University of Notre Dame Scholar Recipient

Published Works

  • Article, Coverage for Attorneys on the Move, Changing Firms, and Retiring, The St. Louis Bar Journal, Fall, 2014

Classes & Seminars

  • Lecture, The Elements of Risk Management, Property Manager Risk Management Seminar, October 4, 2017
  • Lecture, A Walk Down The Audit Trail, Professional Liability Claims Seminar, May 6, 2016
  • Lecture, Water Loss Prevention, Mitigation, and Restoration, From Start to Finish, Property Manager Risk Management Seminar, April 12, 2016
  • Lecture, Risk Management: Reporting for Duty, Property Manager Risk Management Seminar, November 12, 2014
  • Lecture, Risk Management, A Show and Tell, Property Manager Risk Management Seminar, December 4, 2013
  • Lecture, Risk Management for Property Managers, Property Manager Risk Management Seminar, April 30, 2013
  • Lecture, Things That Keep A Lawyer Awake At Night, Property Manager Risk Management Seminar, August 17, 2011

Representative Cases

  • Nobles v. Mercy Hospital Jefferson, et al., Jefferson County Circuit Court (2017)
  • In re: [affordable housing property], (2015) NAD Case No. 2015E000342
  • Fiala v. Bickford Senior Living Grp., LLC, 2015 IL App (2d) 141160 (Ill. App. April 30, 2015)
  • In re: [several properties], (2014) NAD Case No. 2014E000474, NAD Case No. 2014E000475, NAD Case No. 2014E000476, NAD Case No. 2014E000477, NAD Case No. 2014E000478, NAD Case No. 2014E000479, NAD Case No. 2014E000480, NAD Case No. 2014E000481, and NAD Case No. 2014E000482
  • Berra v. Pelikan, Saint Louis County Circuit Court (2014)
  • In re: [affordable housing property], (2013) NAD Case No. 2013E000682
  • In re: [several properties], (2013) NAD Case No. 2012E000546, NAD Case No. 2012E000547, NAD Case No. 2012E000548, and NAD Case No. 2012E000549
  • Carter v. SSC Odin Operating Co., LLC, 976 N.E.2d 344, 348 (Ill. 2012)
  • Patton v. Woodcrest, Lincoln County Circuit Court (2012)
  • Carter v. SSC Odin Operating Company, LLC, 927 N.E.2d 1207 (Ill. 2010)
  • Winch v. Perry Oaks Manor, 376 S.W.3d 708 (Mo. App. E.D. 2012)
  • Roedder v. Callis, 375 S.W.3d 824 (Mo. App. E.D. 2012)
  • Davis v. Am. Optical Corp., 899 N.E.2d 506, 508 (Ill. App. 2008)
  • State v. Johnson, 153 S.W.3d 352 (Mo. App. W.D. 2005)

My Team

Administrative Assistant:
Kathy Voss

Tracy Patterson

Practice Areas

  • Professional Liability
  • Medical Malpractice
  • Personal Injury
  • Insurance Defense
  • Landlord/Tenant

Bar Admissions

  • U.S. District Court Eastern District of Missouri, 2009
  • U.S. District Court Western District of Missouri, 2013
  • Supreme Court of Missouri, 2001
  • Supreme Court of Illinois, 2007


  • Washington University School of Law, St. Louis, Missouri
    • J.D. – 2000
  • University of Notre Dame
    • B.A. – 1997
    • Honors: cum laude
    • Major: Economics
    • Major: History

Professional Associations

  • American Bar Association
  • The Missouri Bar
  • Bar Association of Metropolitan St. Louis
  • Lawyers Association of St. Louis

Employment History

  • Lashly & Baer, P.C., Member, 2010
  • Lashly & Baer, P.C., Associate, 2006 to 2010
  • Holtkamp, Liese, Childress & Schultz, P.C., Associate, 2005 to 2006
  • Carson & Coil, P.C., Associate, 2005
  • State of Missouri Public Defender, 2002 to 2005

Contact Our Attorneys Today

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Plan Your Visit

Lashly & Baer, P.C.


714 Locust Street

St. Louis, MO 63101

Map & Directions

Call: 314-621-2939

Fax: 314-621-6844


20 East Main Street
Belleville, IL 62220

Map & Directions

By Appointment Only
Call: 618-233-5587
Fax: 314-621-6844