Mank was appointed Ambassador of Canada to Indonesia and Timor-Leste in 2003, where he led the Canadian response to the 2004-05 tsunami crisis in the northern Sumatra province of Aceh. He established Canada House in Aceh as a unique platform for all Canadian stakeholders involved in delivering emergency and recovery aid in the disaster zone. He also guided Canada-Indonesia counter-terrorism training and cooperation following numerous terrorist attacks on the Marriott Hotel in Jakarta and other locations in Bali and Java. He deployed election monitoring teams during the 2004 legislative election, as well as the 2005 gubernatorial and mayoral elections, in support of Indonesia's ongoing transition to democracy. On the commercial front, he worked closely with companies on expanding bilateral trade and investment. He also spearheaded the launch of the Canadian BlackBerry smartphone in Indonesia in 2004.