In 1999, the government of Eritrea announced that Hanna Simon was being named ambassador to France.[3] She served in this capacity until 2006 when she was recalled to Asmara, with diplomat Ahmed Dehli stepping into place as chargé d'affaires.[4]
From 2008 to 2011, Simon completed a master's degree at Euclid University in Diplomacy and International Affairs, subsequently being invited to teach the course "Diplomatic Protocol and Immunities."[5] She also served as Eritrea's Director General of the Department of Eritreans Residing Abroad.[5]
In 2014, Simon was once again named ambassador to France.[6] In that year, she was also named Eritrea's Permanent Representative to UNESCO.[7] She commemorated Asmara's designation as a World Heritage Site in 2017.[8]
She has supported greater participation of Eritrea in international organizations and has criticized foreign sanctions on Eritrea.[9]
In 2019, Simon once again stepped down from her position as ambassador, this time under disputed circumstances. Reporting by Africa Intelligence suggested that she was preparing to leave Paris in order to become mayor of Asmara.[10] However, Awate reported that Simon was reluctant to return, and had been removed from her post after writing a critical report to Osman Saleh, the minister of foreign affairs.[11]