M.C. Dean Data Breach Investigation

Turke & Strauss LLP, a leading data breach law firm, is investigating M.C. Dean, Inc. regarding its recent data breach. The M.C. Dean data breach involved sensitive personal identifiable information belonging to an undetermined number of individuals.


M.C. Dean is a global cyber-physical systems integration and engineering company that designs, builds, operates, and maintains electrical, electronic security, telecommunications, life-safety, instrumentation and control, and command and control systems. Since 1949, M.C. Dean has been providing services to the nation’s most recognizable mission-critical facilities, secure environments, complex infrastructure, and global enterprises. Founded by Marion Caleb (M.C.) Dean over 70 years ago as an electrical company run out of his home, M.C. Dean, today, has grown to a $1.3 billion enterprise. Headquartered in Tysons, Virginia, M.C. Dean employs over 5,000 people and has over 30 offices throughout the world.


On June 2, 2022, M.C. Dean discovered that it had experienced a data breach in which the sensitive personal identifiable information in its systems may have been accessed. Through its investigation, M.C. Dean determined that an unauthorized actor accessed its systems and this sensitive information between December 24, 2021, and June 2, 2022. Recently, in September 2022, M.C. Dean began notifying individuals whose information may have been impacted. The exact type of personal information has not been disclosed by M.C. Dean. However, according to state reporting guidelines, “personal information” can include the following types of information:

  • Social Security number
  • Driver’s license number
  • Financial information
  • Medical information
  • Taxpayer information
  • Personal identification number issued by the United States IRS

If you received a breach notification letter from M.C. Dean:

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 sam@turkestrauss.com.

If you were impacted by the M.C. Dean 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 the free credit monitoring service provided by M.C. Dean, 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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