Ambassador Roos' tenure in Tokyo comes at an historic period in U.S.-Japan relations. Shortly after his arrival, power shifted from the Liberal Democratic Party for essentially the first time in 50 years to the Democratic Party of Japan, and Ambassador Roos played a key role in managing the relationship through the transition.

On Aug. 6, 2010 Ambassador Roos became the first U.S. official ever to attend the commemoration ceremony of the atomic bombing in Hiroshima.

Prior to his appointment, Ambassador Roos served as Chief Executive Officer at Wilson Sonsini Goodrich & Rosati, the leading law firm in the U.S. in the representation of technology, life sciences, and emerging growth companies. There he helped lead his firm during the waves of innovation in Silicon Valley, from the growth of software and communications, to the Internet Age and the emergence of biotechnology, to today's focus on clean technology and renewable energy.

Ambassador Roos attended Stanford University and Stanford Law School.