Harold Whistler
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| Status | Alive |
| Occupation | University professor |
| First appearance | “Panopticon” |
| Last appearance | “The Day the World Went Away” |
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Harold Whistler is an alias, that of a university professor, used by Harold Finch. Harold Whistler also has a criminal record for vandalism. (“Nautilus”)
Finch's identity as Harold Whistler is eventually uncovered by Samaritan. (“The Day the World Went Away”)