Rex represents employers throughout the United States in all facets of labor and employment law. He is widely recognized in the field of wage and hour litigation, and has represented clients in numerous class action and collective action lawsuits. He defends employers against discrimination claims in Federal and State courts and before administrative agencies; including claims under Title VII, the Missouri, Illinois and other state Human Rights Acts, the Americans with Disabilities Act, the Age Discrimination in Employment Act, the Family Medical Leave Act, the Equal Pay Act, the Pregnancy Discrimination Act, claims of race and color discrimination and retaliation under 42 U.S.C. § 1981, Employee Retirement Income Security Act of 1974 (ERISA), the Occupational Safety and Health Act, whistleblower and public policy wrongful discharge claims. Rex also represents employers before the National Labor Relations Board in representation matters and unfair labor practice charges.

Rex also assists clients with investigations and audits before the U.S. Department of Labor, the Equal Employment Opportunity Commission, the Occupational Safety and Health Administration, and the Internal Revenue Service.

Rex routines advises governmental entities, non-profit and charitable organizations on a variety of legal compliance matters.

Rex is a sought-after speaker on many employment topics. His presentations include wage-and-hour compliance, employee leave issues, garnishments, and a variety of labor and employment legal updates.

Prior to joining McMahon Berger, an employment and labor law firm based in St. Louis, Missouri, Rex served for six years as Assistant Attorney General for the State of Missouri.