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Following these events Gass posted his views from Tehran on the social networking site Twitter, commenting on the Iranian regime's record on human rights, political prisoners and freedom of speech. His 'tweets' are shared widely by Iranian reformists and diaspora across the web as well as being featured in mainstream media. In January 2011, Gass passed the 1000 follower mark, making him one of the most followed diplomats on Twitter.

In February 2011 Gass was seconded to NATO as Senior Civilian Representative in Afghanistan. After serving in this post for 18 months he returned to the FCO in London as Director General, Political, and the Prime Minister's Special Representative for Afghanistan and Pakistan. He retired from the FCO in 2016.

In December 2010, Gass's digital activities caused mild uproar among Iranian politicians, who called for his expulsion after he highlighted the case of human rights lawyer Nasrin Sotoudeh in an article posted on the British Embassy in Iran website. The statement was released on International Human Rights Day and criticised Iran's human rights record. The Foreign and Commonwealth Office defended Gass's comments, which gained widespread approval from his Iranian reformist followers on Twitter.

He was British Ambassador to Iran 2009–11. He arrived in post during the Spring of 2009 from his previous posting in Greece and was present during the June 2009 protests following the disputed re-election of Iranian President Mahmoud Ahmedinejad.

In the 1998 Queen's Birthday Honours, Gass was appointed a Companion of the Order of St Michael and St George (CMG). In the 2011 New Year Honours, he was promoted to Knight Commander of the Order of St Michael and St George (KCMG).

Sir Simon Lawrance Gass, KCMG, CVO (born 2 November 1956) is a British civil servant. Since 2019, he has been appointed as Chair of the Joint Intelligence Committee. Between 2018 and 2019, he was the Commandant of the Royal College of Defence Studies. During his diplomatic career, he served as British ambassador to Greece and to Iran.