BreachCensus

Gerson Lehrman Group, Inc.

United States of America

Gerson Lehrman Group, Inc. is an organisation in Massachusetts. It appears on the Massachusetts Attorney General breach-notification register, the California Attorney General breach-notification register and the Washington State Attorney General breach-notification register with 1 confirmed incident (2 filings); the most recent notice was filed on March 13, 2024.

Data as of September 6, 2026.

Confirmed incident

Filed in MA, WA, CA and IA

The same incident was filed separately with 4 jurisdictions within a few days of each other (MA, WA, CA and IA) — shown here as one incident.

Disclosed
March 13, 2024

Timeline

  1. March 12, 2024
    Reported to regulator Regulator

    CA AG breach notification: an unknown number of California residents affected

    source
  2. March 12, 2024
    Reported to regulator Regulator

    WA AG breach notification: 3,734 Washington residents affected

    source
  3. March 12, 2024
    Reported to regulator Regulator

    IA AG breach notification: an unknown number of Iowa residents affected

    source
  4. March 13, 2024
    Reported to regulator Regulator

    MA AG breach notification: 6,760 Massachusetts residents affected

    source
What a Massachusetts notice means

Required under M.G.L. c. 93H. Notice to the Attorney General is required for a breach affecting any number of Massachusetts residents' personal information -- the statute sets no minimum count.

Note: the count is Massachusetts residents only, not a total.

Massachusetts breach-notification register ↗

What a Washington notice means

Required under RCW 19.255.010. Notice to the Attorney General is required when a breach affects more than 500 Washington residents.

Note: the count is Washington residents only, not a total.

Washington breach-notification register ↗

What a California notice means

Required under Cal. Civ. Code §1798.82. A copy of the notification must be sent to the Attorney General when a single breach requires notifying more than 500 California residents.

Note: no affected-count is published on this register.

California breach-notification register ↗