Rex P. Fennessey

Rex P. Fennessey: Attorney with McMahon Berger A Professional Corporation


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.

His current practice includes all facets of employment law, including employment discrimination cases under Title VII, the Age Discrimination in Employment Act, the Americans with Disabilities Act, the Family Medical Leave Act, and the Missouri and Illinois Human Rights Acts. Mr. Fennessey also routinely represents both public and private employers in cases brought under the Fair Labor Standards Act, and state wage and hour laws; such as the Missouri Minimum Wage Law, the Illinois Minimum Wage Law, and Illinois Wage Payment and Collection Act. Mr. Fennessey is recognized in the field of wage and hour litigation and has extensive experience representing employers in complex class action lawsuits.

Mr. Fennessey litigates before administrative agencies, Missouri and Illinois circuit courts, the Missouri Court of Appeals for the Eastern and Western District, the Missouri Supreme Court, both United States District Courts in Missouri, the U.S. District Court for the Southern District of Illinois, the U.S. District Court for the Southern Division of Texas, and the United States Court of Appeals for the Eighth Circuit. Mr. Fennessey further represents employers in U.S. Department of Labor investigations and audits, and represents management before the National Labor Relations Board in representation matters and unfair labor practice charges.

Mr. Fennessey is a sought-after speaker for companies and organizations on a broad range of employment topics. His many presentations include wage-and-hour compliance, how employers can systematically handle complicated ADA, FMLA and Workers’ Compensation leave issues, garnishments, and other constantly developing federal and state labor laws.

Mr. Fennessey is recognized for his experience guiding new and existing non-profit organizations on a broad range of issues, and regularly assists these clients in obtaining 501(c) exemption recognition before the Internal Revenue Service.

Blog Posts by
Rex P. Fennessey

DOL Opinion Letter on Traveling Home Health Aide Pay Is a Good Reminder for All Employers: Remember Travel Time!

By Rex P. Fennessey on January 09, 2019

In many industries, employees regularly travel during their workday. In general, when exempt executive, administrative or professional employees or outside sales employees travel, employers need...

Missouri’s Proposition B - More than Just a Minimum Wage Hike

By Rex P. Fennessey on November 16, 2018

When Missouri voters went to the polls on November 6, they considered and passed (by a fairly wide margin) Proposition B, a proposed increase to...

“No-Fault” Attendance Policies and Roll-Off Attendance Points under the FMLA

By Rex P. Fennessey on September 05, 2018

It is a question that often plagues Human Resources Departments: To what extent do company policies regarding attendance apply to employees on protected leave? Most...


By Rex P. Fennessey on July 25, 2018

California Supreme Court Cases All Employers Should Be Watching On July 12, the California Supreme Court agreed to answer several questions about whether California’s wage...

Community Involvement

Center for Autism Education, Board Member

(Also at Collinsville, IL Office)

Areas of Practice (10)

  • Employment Law
  • Labor Law
  • Non-Profit Organizations
  • Municipal and Public Law
  • Appellate Work
  • Policies, Procedures, & Handbooks
  • Training
  • Jury Trial & Arbitration
  • Employment and Labor Law Education
  • Compliance & Ethics

Education & Credentials

Contact Information:
314-567-7350  Phone
University Attended:
University of Missouri, Columbia, B.A., cum laude, 2003
Law School Attended:
University of Missouri, Columbia, J.D., 2006
Year of First Admission:
State of Missouri; United States District Court, Western District of Missouri; United States Court of Appeals, Eighth Circuit; United States District Court, Southern District of Illinois; United States District Court, Southern District of Texas; United States District Court, Eastern District of Missouri

Professional Associations

The Missouri Bar, Member
Bar Association of Metro St Louis, Member
Human Resource Management Association of Greater St. Louis, Member
The Missouri Bar, Young Lawyers Section Representative, District 8 (2013 - 2016)
The Missouri Bar, Missouri Bar Foundation Representative (2016 - Present)
The Missouri Bar, Missouri Bar Foundation fellow (2018)
The Missouri Bar, Missouri Bar Executive Committee on Legislation
American Bar Association, Young Lawyers Division (Feb. 2018)

Payment Information:
  • Fixed Hourly Rates
  • Fixed Fees Available

Peer Reviews

This lawyer does not have peer reviews.

*Peer Reviews provided before April 15, 2008 are not displayed.

Documents (9)

Documents by this lawyer on

St. Louis, Missouri

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