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|Portrayed by||John Aylward|
|First appearance||Christmas Comes But Once a Year|
|Residence||New York, NY|
Geoffrey Atherton is a consumer-researcher who works with Dr. Faye Miller.
The company he works for pitched its services to Sterling Cooper Draper Pryce. At a kickoff meeting Dr. Miller, asked senior staffers to complete a very personal questionnaire that asks for family history, at which Don abruptly excused himself from the presentation. ("Christmas Comes But Once a Year")