Ranked in 1 Practice Areas

About

Provided by Zachary Hafer

USA

Practice Areas

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.

Career

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.

Personal

University of Virginia School of Law, 2003 J.D.; Dartmouth College, 1999 B.A. cum laude

Chambers Review

Provided by Chambers

Chambers Guide to the USA

Litigation: White-Collar Crime & Government Investigations - Massachusetts

3
Band 3
Individual Editorial
Zachary Hafer's practice 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.

Strengths

Provided by Chambers

Discover other Lawyers at
Simpson Thacher & Bartlett LLP

Provided by Chambers
Filter by
Band

California

Capital Markets: Debt & Equity

1
Dan Webb
1
Band 1
1
William B Brentani
1
Band 1
3
Heidi Mayon
3
Band 3
Litigation: Securities

U
Stephen Blake
U
Up and Coming
Private Equity: Buyouts

2
Atif Azher
2
Band 2
4
Robert T Langdon
4
Band 4

California: Los Angeles & Surrounds

Corporate/M&A

4
David Hernand
4
Band 4

California: San Francisco, Silicon Valley & Surro

Employee Benefits & Executive Compensation

2
Tristan Brown
2
Band 2

District of Columbia

Antitrust

2
John Terzaken
2
Band 2
3
Sara Razi
3
Band 3
4
Karen Kazmerzak
4
Band 4
U
Preston Miller
U
Up and Coming
Corporate/M&A & Private Equity

4
Jonathan L Corsico
4
Band 4
Environment: Mainly Transactional

1
Toby Chun
1
Band 1
Litigation: White-Collar Crime & Government Investigations

3
Jeffrey Knox
3
Band 3

Massachusetts

Banking & Finance

3
John Ilardo
3
Band 3
Litigation: White-Collar Crime & Government Investigations

3
Zachary Hafer
3
Band 3

New York

Antitrust

3
Peter Guryan
3
Band 3
Banking & Finance

1
Patrick J Ryan
1
Band 1
2
Brian M. Steinhardt
2
Band 2
20 of 137 results