Isabelle Cheng (), also known as Cheng Nian-tzu, was an intelligence agent for the National Security Bureau of

Taiwan Taiwan, officially the Republic of China (ROC), is a country in East Asia, at the junction of the East and South China Seas in the northwestern Pacific Ocean, with the People's Republic of China (PRC) to the northwest, Japan to the nort ...

. She came to public attention when her relationship with

Donald Keyser Donald Willis Keyser (born 17 July 1943) retired from the United States Department of State in September 2004 after a 32-year career. He had been a member of the Senior Foreign Service since 1990, and held Washington-based ambassadorial-level assig ...

, an official of the

United States Department of State The United States Department of State (DOS), or State Department, is an executive department of the U.S. federal government responsible for the country's foreign policy and relations. Equivalent to the ministry of foreign affairs of other n ...

, became part of criminal charges against Keyser — in 2005, Keyser pleaded guilty to lying about the relationship, and to unauthorized possession of secret documents. Keyser has not been charged with espionage, however. While in the United States, Cheng was operating from the

Taipei Economic and Cultural Representative Office The Taipei Economic and Cultural Representative Office (TECRO), also known as Taipei Economic and Cultural Office (TECO), Taipei Representative Office (TRO) or Taipei Mission, is an alternative diplomatic institution serving as a ''de facto'' e ...

Washington Washington commonly refers to: * Washington (state), United States * Washington, D.C., the capital of the United States ** A metonym for the federal government of the United States ** Washington metropolitan area, the metropolitan area centered o ...

, but has since been called back to Taiwan. Cheng assisted the FBI in their investigation of Keyser.

References

{{DEFAULTSORT:Cheng, Isabelle Living people Taiwanese spies Year of birth missing (living people)