He is the grandson of Emperor Haile Selassie of Ethiopia, and furthermore of Dejazmach Habte Mariam Gebre-Igziabiher, also known as Kumsa Moroda (Oromo: Kumsaa Morodaa) who was the third and last Moti, or ruler, of the Welega kingdom also referred as the Leqa Neqamte state.

Prince Ermias is also patron of the Haile Selassie Fund for Children in Need which continues to sponsor student scholarships, and the St. George of Lalibela Foundation.

On 16 September 2010, Prince Ermias delivered remarks at a briefing entitled "Traditional Leadership in the Modern World: Humanitarianism, Culture and the Diaspora" in the Rayburn House Office Building in Washington, D.C.

This briefing was conducted by Representative Diane Watson, who was a member of the House Foreign Affairs Committee, and whose congressional district in Los Angeles includes Little Ethiopia.

Empanelled with visiting royalty from Cameroon and the Kingdom of Swaziland (Princess Phindiwe Sangweni), Prince Ermias described the cultural leadership exercised by deposed and exiled royalty among members of ethnic communities living in either ancestral lands or diaspora in the United States and the United Kingdom.