Philip Sugden

Context:

Referred to throughout the series as 'really the definitive survey of the case,' with multiple direct quotes from Sugden about the quest for the identity of Jack the Ripper and the assumption that the killer was a local man.

Context:

Referred to as 'The Definitive History' of the Jack the Ripper case, cited multiple times for details about the timeline of the murders and analysis of witness accounts.

Context:

Described as the definitive and most scholarly book on the Ripper case. The hosts reference it multiple times, including Sugden's analysis of witnesses, the killer's profile, and the Jack the Ripper letter, noting that Sugden believes the man seen by Elizabeth Long was the murderer.