On 14 February 1940, a man from the British Foreign Office who called
himself 'Mr Gill' visited the American Embassy in London and advised
Herschel Johnson that a serious leakage of information had been
detected and that their source in Berlin (probably Karl Markus) had
reported that he had heard Kurt Jahnke (his boss) say to his
translator, in reply to a question as to whether there was any
American material on a particular day,

'No, the Doctor has not dictated this morning'.

Evidentally, 'the Doctor' was based in London and he had been leaking
information BEFORE Tyler Kent took up his posting there on 5 October
1939.

So if he wasn't Tyler Kent (who was arrested on 20 May 1940) who was
'the Doctor'?

Several spy writers (including John Costello, Bearse & Read, etc.)
have researched the question without unmasking the man. Yes ... there
was certainly another spy in the State Department but he wasn't based
in London.

Now, I'm betting that Google Answers can succeed where others have
failed.

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Request for Question Clarification by jab-ga on 23 Jul 2002 12:08 PDT

As a starting point, can you provide the reference for the information
you give in your question?

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Clarification of Question by probonopublico-ga on 24 Jul 2002 08:33 PDT

Hi, jab-ga

Yes ... The info is available in the UK PRO Ref KV2/755.

This is the Security Services (MI5) file on Kurt Jahnke, recently
opened to the public.

Regards

Bryan