Gerson Lehrman Group Data Breach Investigation

Turke & Strauss LLP, a leading data breach law firm, is investigating Gerson Lehrman Group, Inc. (“GLG”) regarding its recent data breach. The GLG data breach involved personal identifiable information belonging to over 150,000 individuals.


GLG is an information services provider and insight network based in New York. When leaders need to make informed decisions, GLG provides meaningful connections through its network of experts, the world’s most varied and qualified source of first-hand expertise, with thousands of experts recruited daily to tackle tomorrow’s questions.3 Founded in 1998, GLG provides an unparalleled Trusted Environment, with an industry-leading compliance framework built on integrity and trust that fuels its clients’ confidence to move forward.3 Headquartered in New York, New York, GLG has 18 additional locations across the world and employs over 1,000 individuals.


Recently, GLG discovered that it had experienced a data breach in which personal identifiable information in its systems may have been accessed and acquired. Through its investigation, GLG determined that an unauthorized party may have accessed this sensitive information via a ransomware attack on or about November 12, 2023. On March 12, 2024, GLG began notifying individuals whose information may have been impacted. The type of information potentially exposed includes:

  • Name
  • Social Security number

If you received a breach notification letter from Gerson Lehrman Group, Inc.:

We would like to speak with you about your rights and potential legal remedies in response to this data breach. Please fill out the form, below, or contact us at (608) 237-1775 or

If you were impacted by the GLG data breach, you may consider taking the following steps to protect your personal information.

  1. Carefully review the breach notice and retain a copy;
  2. Enroll in any free credit monitoring services provided by Gerson Lehrman Group, Inc.:
  3. Change passwords and security questions for online accounts;
  4. Regularly review account statements for signs of fraud or unauthorized activity;
  5. Monitor credit reports for signs of identity theft; and
  6. Contact a credit bureau(s) to request a temporary fraud alert.

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