David Cecil, 6th Marquess of Exeter

As an IOC member and president of the IAAF, Burghley presented the medals for the 200 m at the Mexico Olympics in 1968 and appeared in some famous images of the Black Power salute given by Tommie Smith and John Carlos. When later asked what he had thought of the gloves, he said: "I thought they had hurt their hand."

He married secondly on 12 December 1946, Diana Mary Henderson (10 January 1911 – 6 June 1982), granddaughter of Alexander Henderson, 1st Baron Faringdon, and widow of Lt.-Col. David Walter Arthur William Forbes. They had one daughter:

In 1933, Burghley became a member of the International Olympic Committee (IOC). Three years later he was elected President of the Amateur Athletic Association and Chairman of the British Olympic Association. In 1946 he became President of the International Amateur Athletic Federation (IAAF) and later acted as Chairman of the Organizing Committee for the 1948 Summer Olympics. Between 1952 and 1966 he was vice-president of the IOC and was a presidential candidate in 1952 and 1964.

In 1931 Burghley was elected as Member of Parliament (MP) for Peterborough. He was granted a leave of absence to compete in the 1932 Summer Olympics, where he placed fourth in the 400 m hurdles event, fifth in the 110 m hurdles competition, and won a silver medal as a member of the British 4 × 400 metres relay team, which set a new European record in the process.

Burghley was a member of the Conservative and Unionist Party and served as MP for Peterborough from 1931 until 1943. He was first elected in the 1931 general election, when he ousted the sitting Labour MP J. F. Horrabin. Burghley was returned to the House of Commons again in the 1935 general election. He was for many years Chairman of the Junior Imperial League. Burghley resigned his Commons seat in 1943 when he was appointed Governor of Bermuda, a post in which he served until 1945.

A notable runner at school and at Cambridge, he continued with his athletics and won the British AAA championships in 120 yd from 1929 to 1931 and the 440 yd (400 m) hurdles from 1926 to 1928, and again in 1930 and 1932.

Lord Burghley married firstly on 10 January 1929, Lady Mary Theresa Montagu Douglas Scott (4 March 1904 – 1 June 1984), fourth daughter of Sir John Montagu Douglas Scott, 7th Duke of Buccleuch & 9th Duke of Queensberry, and Lady Margaret Alice "Molly" Bridgeman. They had four children before divorcing in 1946:

In June 1927, in his final year at Magdalene College, Cambridge, Burghley sprinted around the Great Court at Trinity College at midnight in the time it took the college clock to toll 12 o'clock. This inspired the scene in the film Chariots of Fire in which Harold Abrahams accomplishes the same feat. The character Lord Andrew Lindsay in Chariots of Fire, played by Nigel Havers, is based upon Burghley, but he did not allow his name to be used because of the inaccurate historical depiction in the film. There was never a race in which Abrahams beat Burghley in this feat as the film suggests; in fact, Abrahams never attempted the Great Court Run.

Burghley made his Olympic debut in Paris in 1924, when he was eliminated in the first round of the 110 metre hurdles event. At the 1928 Summer Olympics, Burghley was eliminated in the semifinal of the 110 metre hurdles competition, but won the 400 metres hurdles, beating second and third placed Americans Frank Cuhel and Morgan Taylor by 0.2 seconds. At the first Commonwealth Games in 1930, Burghley won both hurdling events and was also a member of the gold medal winning British 4×440 yards relay team. In 1927–1930 Burghley also set several British records, one of which, 24.7 s in the 220 yard hurdles, set in 1927, stood until 1950.

David George Brownlow Cecil, 6th Marquess of Exeter, KCMG KStJ (9 February 1905 – 22 October 1981), styled Lord Burghley before 1956 and also known as David Burghley, was an English athlete, sports official, peer, and Conservative Party politician. He won the gold medal in the 400 m hurdles at the 1928 Summer Olympics.