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Attorney Bios

David M. Langevin

Founding Partner

David M. Langevin, Founding Partner of McSweeney / Langevin, is particularly focused on helping injured people put their lives back together after they have been harmed by the negligence or carelessness of others. He stands by his clients for as long as it takes to make sure they are rightfully compensated, regardless of the case’s complexity or difficulty.

Dave has been able to help thousands of clients recover compensation for all types of injuries from all types of wrongful and dangerous conduct - no matter how long or difficult the fight.


Rhett A. McSweeney

Founding Partner

Rhett McSweeney is a Founding Partner of McSweeney / Langevin, a firm focused on mass torts and products liability. His exceptional skills have earned him professional achievement awards, as well as large settlements in national mass tort and class action lawsuits in cases ranging from defective drugs, medical devices and consumer fraud.

Rhett is dedicated to helping individuals fight and win against large multi-national corporations and insurance companies. The high success rate he has maintained over the length of his career is evidence of his unmatched ambition and drive. Rhett is motivated by the satisfaction his clients receive when their rights have been recognized and adequately compensated. His clients enjoy his amicable, engaging nature, as well as his sense of humor and the personal interest and attention he devotes to them.


Diane JoliCoeur-Enga

Diane JoliCoeur-Enga graduated from the University of Minnesota with a degree in psychology and child psychology in 1975.  She obtained her Juris Doctorate from William Mitchell College of Law in 1979.  Diane practiced law at Taylor Law Firm where she and her husband Rick Enga were principals and partners until Rick's death in 2005.  Diane's practice involves all types of personal injuries including:  auto accidents, workers’ compensation injuries, and premises liability cases. 

Mark J. Brandenburger

Mark Brandenburger, attorney at McSweeney / Langevin brings energy and focus to resolving disputes with the best possible outcome for his clients. Motivated by working with people to rebuild their lives after unfortunate circumstances, Mark’s hard work and attention to detail mean his clients receive thorough, dedicated representation.

Mark graduated from the University of St. Thomas in St. Paul, MN with a degree in Business Management and a minor in Legal Studies. After working as a business consultant, he attended William Mitchell College of Law and graduated cum laude. While attending William Mitchell, he served as Editor of the Journal of Law & Practice. He also argued a case at the Minnesota Court of Appeals as part of the Civil Advocacy Clinic during his third year of law school. Mark is a member of the Hennepin County Bar Association and has spoken at St. Paul College to the Scholarship Foundation.

Mark’s personal interests include fishing, hockey, boating, and racquetball, and spending time with his family.