Mark Johnston

The FBI Wall of Honor remembers Supervisory Special Agent Mark Johnston, who died on September 12, 2017 from an illness incurred as a result of his response to the 9/11 attacks in New York.

1952 - 2017

On the morning of September 11, 2001, American Airlines Flight 11 and United Airlines Flight 175 were commandeered by terrorists and crashed into the north and south towers of the World Trade Center in New York City. Later that morning, both towers and surrounding buildings collapsed, sending a large cloud of toxic dust and smoldering debris through lower Manhattan.

Supervisory Special Agent Mark Johnston, who worked in the Newark Field Office’s Atlantic City Resident Agency, responded to ground zero on 9/11, serving as an employee assistance program counselor. In the days and weeks following the attacks, he escorted personnel who lacked security clearances to sensitive areas of the World Trade Center site, including the FBI command center.

In 2011, Johnston was diagnosed with bile duct and ampulla of vater cancer, which was also found in his lymph nodes. He succumbed to the disease on September 12, 2017. Extensive research by the Centers for Disease Control and the National Institute for Occupational Safety and Health established sufficient evidence that Johnston’s exposure to the air in and around the World Trade Center site either precipitated or accelerated his development of the cancer.

Supervisory Special Agent Johnston entered on duty with the FBI in May 1983.