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Band 2
Provided by Zachary Hafer
Zachary Hafer is a Partner in the Government and Internal Investigations Practice in the firm’s Boston office. A former federal prosecutor and prominent trial lawyer, he represents companies, boards and individuals in highly complex and sensitive internal and government investigations, including matters related to the Anti-Kickback Statute, FCA, FCPA, the CARES Act and related SEC matters, among others. Prior to joining private practice, Zach served with the U.S. Attorney’s Office for the District of Massachusetts for 14 years, including as Chief of the Criminal Division, where he supervised approximately 100 federal prosecutors and managed the investigation and prosecution of some of the nation’s most important federal criminal cases.
Practicing since 2003; joined Simpson Thacher as a partner in 2025. Prior to joining Simpson Thacher, Zach was a partner at another international law firm.
University of Virginia School of Law, 2003 J.D.; Dartmouth College, 1999 B.A. cum laude
Provided by Chambers
Zachary Hafer's practice of Simpson Thacher & Bartlett LLP benefits from his extensive experience as a former federal prosecutor. He is highly sought after by companies, boards and individuals in internal and government investigations, as well as litigation.
Provided by Chambers
Zach works tirelessly and never gives up. He out-works, out-thinks and out-performs. He is a true warrior.
Zach is a skilled trial lawyer with intelligence and a strong sense of what will persuade the court.
Zach knows when to draw the line and instills great confidence in his client. He is very energetic with a lot of trial experience. He is never afraid of conflict.
Zach is great, very smart and incredibly practical. He knows the judges really well so he is thoughtful about how things will play in front of the judge.
Zach has a very keen intellect and great strategic decision-making skills. He has a deep understanding of how the other side make decisions given his extensive experience in government.
Zach works tirelessly and never gives up. He out-works, out-thinks and out-performs. He is a true warrior.
Zach is a skilled trial lawyer with intelligence and a strong sense of what will persuade the court.
Zach knows when to draw the line and instills great confidence in his client. He is very energetic with a lot of trial experience. He is never afraid of conflict.
Zach is great, very smart and incredibly practical. He knows the judges really well so he is thoughtful about how things will play in front of the judge.
Zach has a very keen intellect and great strategic decision-making skills. He has a deep understanding of how the other side make decisions given his extensive experience in government.