Our Team

Peter C. Grenier

Principal

Recognized as “Washington’s Hottest Personal Injury Lawyer” by Washingtonian Magazine. Peter Grenier is widely recognized as one of the country’s most successful civil trial attorneys, having amassed more than $475,000,000.00 in verdicts and settlements.

John Antishin

Associate

John Antishin joined GLG after graduating from The George Washington University Law School. While in law school, Mr. Antishin interned with the United States General Services Administration and the United States Army Judge Advocate General’s Corps. Additionally, he was a member of the Moot Court, Mock Trial, and Alternative Dispute Resolution skills boards, as well as an Articles Editor for the Federal Circuit Bar Journal.

Daniel Cappelletti

Associate

Daniel Cappelletti is an Associate at Grenier Law Group PLLC. Mr. Cappelletti joined after a nearly two year clerkship with the Honorable José M. López in the Superior Court of the District of Columbia.

Mr. Cappelletti is a Bethesda, MD native and graduated from the American University Washington College of Law. During law school, he served as a Note & Comment Editor on the American University International Law Review, Student Attorney in the International Human Rights Law Clinic, Law Clerk at the Maryland Office of the Public Defender, and Dean’s Fellow for Dean Emeritus Claudio Grossman. Prior to attending law school, Mr. Cappelletti earned his B.A. in Law and Society from the American University in 2012.

Nancy Grenier

Office Manager

Mara Osterburg

Paralegal 

Mara Osterburg is a paralegal at Grenier Law Group. Ms. Osterburg is originally from Denver, Colorado and recently graduated from American University summa cum laude with a BA in Justice and Law (concentrating in Criminology) and a BA in Psychology.

Genevieve Grenier

Paralegal (Part-time)

Genevieve Grenier is a part-time paralegal at Grenier Law Group.  She is a student at the Georgetown University McDonough School of Business.