[2] He was notable for his tenure as Ambassador to the United States, serving from 17 September 1986 to 30 June 1989 during the administrations of Prime Ministers Muhammad Khan Junejo and Benazir Bhutto.

[4] Jamsheed Kekobad Ardeshir[7] Marker was born in Hyderabad, India, on 24 November 1922, into a distinguished Parsee (Parsi),[8] or Zoroastrian, family that had been in shipping business.

[5][6] During World War II, Marker was an officer in the Royal Indian Naval Volunteer Reserve, commanding a minesweeper.

[4] He worked in his family business, shipping and pharmaceuticals, after the Second World War ended, and during the 1950s became famous for his radio commentary on cricket, one of Pakistan’s most popular sports.

[6][4] Marker worked in his family's shipping business until April 1965, when he was appointed Pakistan's High Commissioner to Ghana during the height of popularity for its independence leader Kwame Nkrumah, with concurrent accreditation to Guinea and Mali.

[10][13][4] Jamsheed Marker was able to communicate in English, French, German, Russian, Urdu and his native language Gujarati.

[3] Marker, in his 2010 memoir "Quiet Diplomacy," described contacts with official and unofficial representatives from both the United States and the Soviet Union, where he had also been ambassador.

"[2][10] The British journalist Richard Lloyd Parry, in his book In the Time of Madness,[16] recalls Marker's words of praise for the Indonesian police and the "superb leadership" of their commander Timbul Silaien after the referendum on independence for East Timor and its bloody preamble.

[2] In his book "Cover Point" (2016), Marker remembered General Ayub Khan, Pakistan’s first military ruler, as a leader who "did give us security, law and order, good governance and economic prosperity.