In his office with Finney and two detectives, Brussel examined the crime-scene photos and letters and discussed the bomber's metal-working and electrical skills. As he talked with the police, Brussel developed what he called a kind of "portrait" of the bomber, what would now be called an offender profile. The bomber's belief that he had been wronged by Consolidated Edison and by others acting in concert with Consolidated Edison seemed to dominate his thoughts, leading Brussel to conclude that the bomber was suffering from paranoia, a condition he describes as "a chronic disorder of insidious development, characterized by persistent, unalterable, systematized, logically constructed delusions." Based on the evidence and his own experience dealing with psychotic criminals, Brussel put forth a number of theories beyond the obvious grudge against Consolidated Edison: