About
Hendrik Lammers is an associate in Constantine LLP’s Washington, DC office who works in the firm’s Antitrust Litigation & Counseling and Whistleblower Representation practice groups. His work centers on complex disputes involving competition law, antitrust issues, and whistleblower matters. He brings prior experience representing clients in antitrust litigation in the finance and banking sector, giving him a foundation for matters that involve detailed market issues, business conduct, and high-stakes commercial claims.
Hendrik graduated from the University of Richmond, T.C. Williams School of Law and earned a bachelor’s degree in Philosophy from McDaniel College. During law school, he interned with the Virginia Office of the Attorney General and volunteered with the Legal Aid Justice Center. His education and public-service experience strengthened his legal research, writing, and analytical skills and exposed him to government and public-interest work before he entered private commercial litigation practice.
Hendrik previously represented clients at a Global 100 law firm, where his work primarily involved antitrust litigation in the finance and banking sector. At Constantine LLP, his practice includes antitrust litigation and counseling as well as whistleblower representation. This background allows him to work on disputes that require close review of business practices, market conduct, financial-industry issues, and litigation strategy while coordinating legal analysis with the factual and economic questions common in competition cases.
Hendrik Lammers is admitted to practice in the District of Columbia and works from the firm’s Washington office. His experience combines antitrust litigation, financial-sector disputes, government exposure, and public-interest service. He assists clients with complex commercial and competition matters by analyzing legal and factual issues, supporting litigation strategy, and addressing the procedural demands of cases involving antitrust claims, market conduct, and whistleblower concerns.
Law Office Affiliations
- Attorney, Constantine LLP
- Member, District of Columbia Bar
Licensed State
- District of Columbia
Education
- McDaniel College
Bachelor’s degree in Philosophy
Awards & Badges

- Arbitration
- Business Litigation
- Class Action
- E-Discovery
- Intellectual Property Litigation
- Lawsuits & Disputes
- Litigation





