Question: During which years was the British statesman, for which Knox Cunningham was Parliamentary Private Secretary, Prime Minister of the United Kingdom?

Related documents: [0]  [DOC] Sir Samuel Knox Cunningham, 1st Baronet, QC (3 April 1909 – 29 July 1976) was a Northern Irish barrister, businessman and politician. As an Ulster Unionist politician at a time when the Unionists were part of the Conservative Party, he was also a significant figure in United Kingdom politics as Parliamentary Private Secretary to Harold Macmillan. His nephew was Sir Josias Cunningham. [END] 
[1]  [DOC] Maurice Harold Macmillan, 1st Earl of Stockton, {'1': ", '2': ", '3': ", '4': "} (10 February 1894 – 29 December 1986) was a British statesman of the Conservative Party who served as Prime Minister of the United Kingdom from 1957 to 1963. Nicknamed "Supermac", he was known for his pragmatism, wit and unflappability. [END]  
Answer: 1957 to 1963
1957 to 1963