John Meehan is known for his involvement in various criminal activities, particularly as a con artist. He gained notoriety for his manipulative behavior and deceitful tactics, which he used to exploit individuals and relationships. His actions have been the subject of media coverage and public interest. Meehan's life and crimes were notably featured in the true crime documentary series titled Dirty John. This series highlighted his deceptive nature and the impact of his actions on those around him, leading to increased awareness about the dangers of manipulation and emotional abuse in relationships.