Rex P. Fennessey Associate


Rex P. Fennessey represents the interests of employers in all areas of labor and employment law.

Prior to joining McMahon Berger, Mr. Fennessey served for six years as an Assistant Attorney General for the State of Missouri, where he defended the interests of the State, its agencies, and its elected and appointed officials in civil rights, employment discrimination, education law, and professional licensing matters. Mr. Fennessey has litigated before administrative agencies, Missouri circuit courts, the Missouri Court of Appeals for the Eastern and Western District, the Missouri Supreme Court, both United States District Courts in Missouri, and the United States Court of Appeals for the Eighth Circuit.

Mr. Fennessey routinely counsels clients on a wide range of employment, labor law and pre-litigation issues. His practice includes all facets of employment law, including employment discrimination cases under the Missouri Commission on Human Rights, Title VII, the Age Discrimination in Employment Act, the Americans with Disabilities Act, the Family Medical Leave Act, Fair Labor Standards Act, and in representing management before the National Labor Relations Board. He is involved in litigating employment discrimination claims as well as investigating and responding on behalf of management to employee claims before administrative agencies. In addition, he assists in advising clients on day-to-day employment-related matters.


University of Missouri, Columbia



cum laude

University of Missouri, Columbia



Alternative Dispute Resolution Certificate

Admitted To Practice

  • State of Missouri
  • United States District Court, Eastern District of Missouri
  • United States District Court, Western District of Missouri
  • United States Court of Appeals, Eighth Circuit

Professional Associations

Young Lawyers Section Representative, District 8 (2013 - Present)