Answer:
Mr Henry is most likely suffering from Paranoid Personality Disorder(PPD)
Explanation:
Individuals with paranoid personality disorder are usually known to have a history of generalized distrust and suspicion of others.
People with paranoid personality disorder will almost always assume that other people's intentions are deceptive or even malevolent.
The staff working with Mr Henry will likely felt uncomfortable and unappreciated at work due to their superior disorder which may have lead to willing resignation or Suspension.