Matthew J. Koster

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Matthew J. Koster



Matthew J. Koster is a Partner in our New York City office. He focuses his practice on representing employers in labor and employment matters, medical malpractice, professional malpractice and ethics, premises liability, labor law and industrial code violations, property damage, breach of contract, general liability cases, and insurance coverage disputes.

Clients routinely engage Matthew for training and prevention seminars on best workplace practices.

Prior to joining HBS, Matthew was Partner at a local insurance defense firm where he specialized in labor and employment, construction, professional malpractice, and premises liability matters. He also worked at a national law firm where he handled labor and employment, E&O liability, construction, and premises liability matters.

Matthew earned his Juris Doctor from the University of Virginia and a Bachelor of Arts, magna cum laude, in History from the University of Pennsylvania. He resides in Brooklyn with his wife and two sons.



State Courts:

  • New Jersey
  • New York

U.S. District Courts:

  • U.S. District Court for the District of New Jersey
  • U.S. District Court for the Eastern District of New York
  • U.S. District Court for the Southern District of New York


  • J.D., University of Virginia
  • B.A., magna cum laude, History, University of Pennsylvania

In the Press

Hall Booth Smith Expands New York City Office with Addition of Four Attorneys

New York, NY – Hall Booth Smith, P.C. (HBS) has added four attorneys to its New York City office as the firm expands to serve its clients in the state of New York. Warren S. Koster is a Partner in our New York City office. He comes to HBS with extensive experience in a wide variety of insurance