International Telecommunication Union

Utsumi had already contributed to the ITU before joining the organisation. He spent three years, from 1978 onward, as First Secretary of the Permanent Mission of Japan in charge of ITU affairs in Geneva, elected as its Chairman at the 1994 ITU Plenipotentiary Conference was held in Kyoto where he witnessed the approval of a Japanese proposal for the creation of the ITU's World Telecommunication Policy Forum (WTPF).^[1]

In 1998, Utsumi was elected as ITU Secretary-General at the Plenipotentiary Conference in Minneapolis. He was elected for a second term at the 2002 conference in Marrakesh. He was not a candidate for reelection in 2006 as the ITU rules do permit more than 2 consecutive periods as secretary-general. His tenure was marked by achieving significant cost-savings within the organisation and the organisation of the United Nations' World Summit on the Information Society (WSIS), whose first gathering took place in two phases, in Geneva in 2003 and Tunis in 2005 and involved more than 30,000 attendees, including around one hundred Heads of State and Government.^[1]

Utsumi introduced measures that led to a nineteen-percent increase in private sector membership of ITU.^[1]