He has held various middle and senior management positions in the department and has served as a diplomat in various Papua New Guinea diplomatic missions overseas, including as second secretary in Jakarta, Indonesia from 1989 to 1990 and deputy head of Papua New Guinea’s mission in Seoul, South Korea from 1994 to 1997. From 1997 to 2001 and 1999 to 2002, Mr. Yuasise served twice as director of the Australia, Pacific and New Zealand branch of the Papua New Guinea’s Department of Foreign Affairs and Trade.

Between 2002 and 2005, he was the acting director-general for the International Relations Division. In 2005, he served as the deputy high commissioner in Canberra, Australia. Mr. Yuasise then became the director of security assessment at the Office of Security Coordination and Assessment in the Prime Minister and National Executive Council in July 2008. He was appointed as the acting director of the Security and International Relations Strategic Focus Area for Papua New Guinea Vision 2050 in 2010.  Mr. Yuasise holds a bachelor’s degree in political science and strategic management from the University of Papua New Guinea and a master’s degree in international relations from the University of Wollongong in New South Wales, Australia.