Fred is a research analyst who works long hours at his job. Fred lives alone, has no friends and seldom speaks to others. This behavior is reflective of which personality disorder?

Schizoid Personality Disorder

Explanation:

People who suffer from Schizoid Personality Disorder prefer their own company to the company of others. They have very few friends and are often described as loners. This comes across as disinterest in relationships, including romantic relationships and those with family. Sufferers of this disorder struggle to express their emotions.

In this example, Fred prefers not to socialise with others and avoids other people, thus indicating that he has Schizoid Personality Disorder.