Steven Grant

Steven Grant was the Chief of Security at CTU National Headquarters during Day 10.

Before Day 10
Despite being married, sometime before Day 10, Grant started an affair with Jennifer Marshall, an employee at Teradyne.

Background information and notes

 * It is unclear whether his name is spelled "Steven" or "Stephen". Dan Bucatinsky referred to him as "Steven" in social media, while subtitles on streaming services like Hulu used "Stephen".