Ivo Sieber, a law graduate from the University of Zurich and holder of a Master of Laws from the University of Sydney, began his diplomatic career in 1988 with the Swiss Federal Department of Foreign Affairs.

Sieber's ambassadorial roles commenced in 2010 in Manila, covering multiple Pacific nations. His significant postings include serving in Zimbabwe, New York, Bangkok, and London. In 2015, he became Ambassador to Thailand, Laos, and Cambodia, and from 2019 to 2022, he served as the Ambassador to Vietnam