It is generally the practice in Indonesia to refer to a person using their first name and the person should be referred to by the first name, Mahendra
Mahendra Siregar (born in Jakarta on 17 October 1962) is the Indonesian Ambassador to the United States.
On 25 October 2019 he was appointed as the deputy minister of foreign affairs supporting Indonesian foreign minister Retno Marsudi in the second Jokowi cabinet appointed two days earlier on 23 October.
Earlier, he had been appointed as Ambassador to the US by president Joko Widodo in 2018.
He had taken up his post in Washington DC in early 2019.
Mahendra is a respected economist in Indonesia who has held various senior positions within the Indonesian bureaucracy.